You are working with an incorrectly maintained user master record
Message type: E = Error
Message class: M3 - Material Master
Message number: 312
Message text: You are working with an incorrectly maintained user master record
How to fix this error?
INCLUDE NA_SYSTVERW1
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.