diff --git a/backend/src/main/resources/dynamic-http-metadata-provider.schema.json b/backend/src/main/resources/dynamic-http-metadata-provider.schema.json
index 7d799784b..8be8bbf9b 100644
--- a/backend/src/main/resources/dynamic-http-metadata-provider.schema.json
+++ b/backend/src/main/resources/dynamic-http-metadata-provider.schema.json
@@ -122,7 +122,7 @@
                                     "title": "label.background-init-from-cache-delay",
                                     "description": "tooltip.background-init-from-cache-delay",
                                     "type": "string",
-                                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                                 }
                             }
                         },
@@ -149,19 +149,19 @@
                     "title": "label.min-cache-duration",
                     "description": "tooltip.min-cache-duration",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "maxCacheDuration": {
                     "title": "label.max-cache-duration",
                     "description": "tooltip.max-cache-duration",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "maxIdleEntityData": {
                     "title": "label.max-idle-entity-data",
                     "description": "tooltip.max-idle-entity-data",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "removeIdleEntityData": {
                     "title": "label.remove-idle-entity-data",
@@ -172,7 +172,7 @@
                     "title": "label.cleanup-task-interval",
                     "description": "tooltip.cleanup-task-interval",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "persistentCacheManagerDirectory": {
                     "title": "label.persistent-cache-manager-directory",
@@ -271,7 +271,7 @@
                             "PT24H"
                         ]
                     },
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "connectionTimeout": {
                     "type": "string",
@@ -291,7 +291,7 @@
                             "PT24H"
                         ]
                     },
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "socketTimeout": {
                     "type": "string",
@@ -311,7 +311,7 @@
                             "PT24H"
                         ]
                     },
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "tlsTrustEngineRef": {
                     "type": "string",
@@ -412,7 +412,7 @@
                             "title": "label.max-validity-interval",
                             "description": "tooltip.max-validity-interval",
                             "type": "string",
-                            "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                            "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                         }
                     }
                 },
diff --git a/backend/src/main/resources/file-system-metadata-provider.schema.json b/backend/src/main/resources/file-system-metadata-provider.schema.json
index f2ce9e7c3..d238018b9 100644
--- a/backend/src/main/resources/file-system-metadata-provider.schema.json
+++ b/backend/src/main/resources/file-system-metadata-provider.schema.json
@@ -52,13 +52,13 @@
                     "title": "label.min-refresh-delay",
                     "description": "tooltip.min-refresh-delay",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "maxRefreshDelay": {
                     "title": "label.max-refresh-delay",
                     "description": "tooltip.max-refresh-delay",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "refreshDelayFactor": {
                     "title": "label.refresh-delay-factor",
diff --git a/backend/src/main/resources/filebacked-http-metadata-provider.schema.json b/backend/src/main/resources/filebacked-http-metadata-provider.schema.json
index 655ff5e0d..9ce22ca94 100644
--- a/backend/src/main/resources/filebacked-http-metadata-provider.schema.json
+++ b/backend/src/main/resources/filebacked-http-metadata-provider.schema.json
@@ -130,7 +130,7 @@
                             "PT24H"
                         ]
                     },
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "connectionTimeout": {
                     "type": "string",
@@ -150,7 +150,7 @@
                             "PT24H"
                         ]
                     },
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "socketTimeout": {
                     "type": "string",
@@ -170,7 +170,7 @@
                             "PT24H"
                         ]
                     },
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "tlsTrustEngineRef": {
                     "type": "string",
@@ -257,13 +257,13 @@
                     "title": "label.min-refresh-delay",
                     "description": "tooltip.min-refresh-delay",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "maxRefreshDelay": {
                     "title": "label.max-refresh-delay",
                     "description": "tooltip.max-refresh-delay",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "refreshDelayFactor": {
                     "title": "label.refresh-delay-factor",
@@ -297,7 +297,7 @@
                             "title": "label.max-validity-interval",
                             "description": "tooltip.max-validity-interval",
                             "type": "string",
-                            "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                            "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                         }
                     }
                 },
diff --git a/backend/src/main/resources/i18n/messages.properties b/backend/src/main/resources/i18n/messages.properties
index 9789f7299..b01f704ba 100644
--- a/backend/src/main/resources/i18n/messages.properties
+++ b/backend/src/main/resources/i18n/messages.properties
@@ -491,6 +491,8 @@ label.provider=Metadata Provider
 
 message.user-role-admin-group=Cannot change group for ROLE_ADMIN users.
 
+message.duration=Requires a valid ISO 8601 duration (ex. PT2D)
+
 message.delete-user-title=Delete User?
 message.delete-user-body=You are requesting to delete a user. If you complete this process the user will be removed. This cannot be undone. Do you wish to continue?
 
diff --git a/backend/src/main/resources/local-dynamic-metadata-provider.schema.json b/backend/src/main/resources/local-dynamic-metadata-provider.schema.json
index 07fcf7674..1b1951dac 100644
--- a/backend/src/main/resources/local-dynamic-metadata-provider.schema.json
+++ b/backend/src/main/resources/local-dynamic-metadata-provider.schema.json
@@ -55,19 +55,19 @@
                     "title": "label.min-cache-duration",
                     "description": "tooltip.min-cache-duration",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "maxCacheDuration": {
                     "title": "label.max-cache-duration",
                     "description": "tooltip.max-cache-duration",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "maxIdleEntityData": {
                     "title": "label.max-idle-entity-data",
                     "description": "tooltip.max-idle-entity-data",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "removeIdleEntityData": {
                     "title": "label.remove-idle-entity-data",
@@ -78,7 +78,7 @@
                     "title": "label.cleanup-task-interval",
                     "description": "tooltip.cleanup-task-interval",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 }
             }
         }
diff --git a/ui/public/assets/schema/provider/filebacked-http.schema.json b/ui/public/assets/schema/provider/filebacked-http.schema.json
index a85d1e400..860733486 100644
--- a/ui/public/assets/schema/provider/filebacked-http.schema.json
+++ b/ui/public/assets/schema/provider/filebacked-http.schema.json
@@ -130,7 +130,7 @@
                             "PT24H"
                         ]
                     },
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "connectionTimeout": {
                     "type": "string",
@@ -150,7 +150,7 @@
                             "PT24H"
                         ]
                     },
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "socketTimeout": {
                     "type": "string",
@@ -170,7 +170,7 @@
                             "PT24H"
                         ]
                     },
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "tlsTrustEngineRef": {
                     "type": "string",
@@ -257,13 +257,13 @@
                     "title": "label.min-refresh-delay",
                     "description": "tooltip.min-refresh-delay",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "maxRefreshDelay": {
                     "title": "label.max-refresh-delay",
                     "description": "tooltip.max-refresh-delay",
                     "type": "string",
-                    "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                    "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                 },
                 "refreshDelayFactor": {
                     "title": "label.refresh-delay-factor",
@@ -297,7 +297,7 @@
                             "title": "label.max-validity-interval",
                             "description": "tooltip.max-validity-interval",
                             "type": "string",
-                            "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
+                            "pattern": "^$|^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
                         }
                     }
                 },
diff --git a/ui/src/app/dashboard/view/SourcesTab.js b/ui/src/app/dashboard/view/SourcesTab.js
index d60218f08..76c5d3770 100644
--- a/ui/src/app/dashboard/view/SourcesTab.js
+++ b/ui/src/app/dashboard/view/SourcesTab.js
@@ -5,10 +5,14 @@ import SourceList from '../../metadata/domain/source/component/SourceList';
 import { useMetadataEntities, useMetadataEntity } from '../../metadata/hooks/api';
 import { Search } from '../component/Search';
 
+import { NotificationContext, createNotificationAction } from '../../notifications/hoc/Notifications';
+
 const searchProps = ['serviceProviderName', 'entityId', 'createdBy'];
 
 export function SourcesTab () {
 
+    const { dispatch } = React.useContext(NotificationContext);
+
     const [sources, setSources] = React.useState([]);
 
     const { get, response } = useMetadataEntities('source', {
@@ -37,6 +41,7 @@ export function SourcesTab () {
             idOfOwner: group
         });
         if (updater.response.ok) {
+            dispatch(createNotificationAction(`Updated group successfully.`));
             loadSources();
         }
     }
diff --git a/ui/src/app/form/component/fields/FilterTargetField.js b/ui/src/app/form/component/fields/FilterTargetField.js
index 959306b71..3bd6fb26a 100644
--- a/ui/src/app/form/component/fields/FilterTargetField.js
+++ b/ui/src/app/form/component/fields/FilterTargetField.js
@@ -252,7 +252,7 @@ const FilterTargetField = ({
                                 <FilterTargetPreview entityId={id}>
                                     {(preview, loading, xml) => (
                                         <React.Fragment>
-                                            {id}
+                                            <span tabIndex="0">{id}</span>
                                             <span>
                                                 {preview &&
                                                     <Button disabled={loading || !xml} type="button" 
diff --git a/ui/src/app/form/component/widgets/OptionWidget.js b/ui/src/app/form/component/widgets/OptionWidget.js
index 534595ead..b1b43fee5 100644
--- a/ui/src/app/form/component/widgets/OptionWidget.js
+++ b/ui/src/app/form/component/widgets/OptionWidget.js
@@ -51,6 +51,7 @@ const OptionWidget = ({
 
     const _onChange = (selected) => {
         const sel = selected[0];
+        
         const val = typeof sel === 'object' && sel.label ? sel.label : sel;
         setInputValue(val);
         onChange(val);
diff --git a/ui/src/app/metadata/domain/provider/definition/BaseProviderDefinition.js b/ui/src/app/metadata/domain/provider/definition/BaseProviderDefinition.js
index c801ddb04..d9eeee51a 100644
--- a/ui/src/app/metadata/domain/provider/definition/BaseProviderDefinition.js
+++ b/ui/src/app/metadata/domain/provider/definition/BaseProviderDefinition.js
@@ -24,14 +24,21 @@ export const BaseProviderDefinition = {
     },
     parser: (changes, base) => {
 
-        const baseFilters = base ? base.metadataFilters.filter(f => MetadataFilterTypes.indexOf(f['@type']) > -1) : []
+        const baseFilters = base ? base.metadataFilters.filter(f => MetadataFilterTypes.indexOf(f['@type']) > -1) : [];
 
         const parsed = (changes.metadataFilters ? ({
             ...changes,
             metadataFilters: [
-                ...changes.metadataFilters.filter((filter, filterName) => (
-                    Object.keys(filter).filter(k => k !== '@type').length > 0
-                )),
+                ...changes.metadataFilters.filter((filter, filterName) => {
+
+                    if (filter['@type'] === 'RequiredValidUntil') {
+                        if (!filter.maxValidityInterval || filter.maxValidityInterval === "") {
+                            return false;
+                        }
+                    }
+
+                    return Object.keys(filter).filter(k => k !== '@type').length > 0;
+                }),
                 ...baseFilters
             ]
         }) : changes);
@@ -43,7 +50,7 @@ export const BaseProviderDefinition = {
         if (!filterSchema || !changes) {
             return changes;
         }
-
+        
         const formatted = (changes.metadataFilters ? ({
             ...changes,
             metadataFilters: Object.values(filterSchema.items).map(item => {