SAP Message RSAN_WB101 - The field assignment for unknown target field &1 is being deleted

Diagnosis
A field assignment exists for the target field &V1&. However, thisfield is not found in the target structure.
This status can occur when fields have been deleted from the targetstructure.

System Response
The system deletes the invalid field assignment.

Procedure
Leave the dialog box for field assignment maintenance by confirming itand save the corrected field assignments.