Configuration Level:
At the configuration level, the changes enforce data integrity by introducing an application business rule (ruleSingleValuedAttributeUnique) in EnrollmentAttributesTable. This rule prevents administrators from adding duplicate single-valued Person and Person Role attributes (such as cou_id, affiliation_type_id, title, department, organization, sponsor_person_id, manager_person_id, valid_from, and valid_through) within the same Attribute Collector plugin instance, rejecting conflicting duplicates with a localized error message.

Runtime Collection & Hydration Level:
During enrollment flow execution, the changes enable seamless cross-step attribute pre-population and preserve single Person Role consolidation. In AttributeCollectorsController and form rendering elements (field.php, fieldset-field.php), previously submitted petition values are matched by attribute name across steps, allowing subsequent Attribute Collector steps to display earlier values as editable defaults while updating Petition.cou_id deterministically for the active step. During finalization (hydrate), querying is scoped to the current step instance, and PersonRolesTable::saveAttributeCollectorPetitionAttributes() patches an existing non-pipeline PersonRole (or resolves it for role-level MVEAs) rather than creating new records on every step, guaranteeing that all Attribute Collector steps merge into exactly one unified Person Role for the enrollee.