Available with Standard or Advanced license.
This message is displayed in the Editing Status dialog box.
Cause
This layer contains data that participates in a relationship class and requires additional ArcGIS Pro licensing to be edited.
This layer contains data that participates in a relationship class and requires additional licensing to be edited.
Solution
Upgrade your ArcGIS Pro license.
Use ArcGIS Pro to edit the relationship and upgrade your ArcGIS Pro license if necessary.