Diagnosis
You assigned the screen &1 to the material type but this screen isalready assigned to material type &2 in client &3.

System Response
This is a only a warning. You should only assign the same screen todifferent material types and system clients if the combination hasexactly the same attributes for the material creation.
Note that the maintenance screen is generated dynamically in thebackground for the material creation process. If you have several usersusing the material creation simultaneously for different material types,the screen could be generated during product maintenance and the userinterface could be changed.
It is not critical if different material types and clients have exactlythe same attributes for the material maintenance.

Procedure
Use the input help to display screens that are not used.