Data 360: Unmapping error: "Unable to delete the field mapping. Please try again GackId: xxxxxxxx-xxxxxx (xxxxxxxxx)"

Check Flexi Page Dependencies:

• One of the primary causes of the Gack ID error is flexi page dependencies.
• Review the related help article: [Data 360: Unmapping error: "Unable to delete the field mapping. The field is used in a flexi page."].
• Follow the steps in the article to ensure that the field is not in use on any flexi pages.

Verify DLO Usage in IR Reconciliation Rule Source Priority:

• If the field is used in the DLO (Data Lake Object) within an IR (Identity Resolution) Reconciliation Rule, it may cause the Gack ID error.
• Check if the specific DLO is part of the source priority order and, if necessary, remove it from that source priority to resolve the conflict.

Check Data Transform Dependencies:

• Ensure that the field is not used in any data transforms, especially for individual and unified individual data.
• You can see individual transforms in the dependencies popup window.
• However, if the unified individual is used in the data transform, it may not appear in the dependencies dialog box. You will need to manually verify its usage in the data transforms.

Check Related List Dependencies:

• If you're encountering the Gack ID error while deleting mappings for engagement DMOs, it could be related to the creation of a related list for these DMOs.
• Review the related lists associated with the engagement DMOs and ensure that no dependencies exist before attempting to delete the mappings.

Final Step:

• After addressing all dependencies (flexi page, DLO in reconciliation rules, and data transforms), try deleting the field mappings again. This should resolve the Gack ID error and allow you to proceed with the deletion.