Message type: E = Error
Message number: 031
Message text: Mixed data in input composition of specification &1
The input composition of specification &v1& contains a mix of material
categories that are not allowed: you can use basic materials or
surfaces, or you can use other material categories, but don't mix them.
The migration will skip this input composition and continue with the
Correct the input composition.
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.