SAP Message AD076 - You cannot change active fields in this mode

Diagnosis
You have selected a maintenance function for an active field.
In this mode you can only add fields to the end ofthe table and maintain these fields. The active version of the tablestructure may not be changed. Consequently only display functionsare allowed for active fields.

System Response
The system sends an information message and ignores the chosen function.

Procedure
Select a display function for the active fields or positionthe cursor on another field.