Concurrent usage of the Data Dictionary is impossible because the users are not informed when someone else is working on a specific Data Dictionary. Ideally, it should say, "Hey, you can only view it because John Doe is working on it".
Use-case:
Editing of the Data Dictionary for Forms and Letters (Correspondence Management / Interactive communication
Current/Experienced Behavior:
Every user can edit the Data Dictionary; the last edit prevails
Improved/Expected Behavior:
Once a user edits the Data Dictionary, the Data Dictionary is locked until the editing user has saved the changes.
Environment Details (AEM version/service pack, any other specifics if applicable):
This has been reported to the engineering under the internal reference FORMS-11726. The product team will triage this request to verify feasibility based on the prioritization model. This post will be updated according to the Jira request status.