is it possible to restrict PP users by material type for transaction MM01? When I am checking the authorisation objects and go into materials management: master data - material master: material types (M_MATE_MAR). All I can see in here is activity (01) and auth group. Is there any way to restrict by material type?
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You need to assign auth groups to material types via table T134.
When you have done that, you can use M_MATE_MAR to restrict activities against that material type. Actvt 01 is only appearing for MM01 as MM01 is used to create, you can also restrict access to change, display or delete the material types with actvt 02 & 03 & 06 respectively (MM02, MM03 etc)
The auth check on auth group will only be performed when there is an auth group assigned to the material type. If there is no auth group on that type the check will be skipped.
Hope that helps.