Message type: E = Error
Message class:  WRF_FOLUPART - Follow-Up/Replacement Material 
Message number: 052
Message text: Material category of original mat. & and follow-up mat. & not identical
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
The system only creates follow-up/replacement material relationships if
the orignial material and the follow-up/replacement material have the
same material type.
This check is defined in an implementation of BAdI WRF_FOLUP_ACTION_E.
Select an original material and a follow-up/replacement material with
the same material type.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message WRF_FOLUPART052 indicates that there is a mismatch between the material categories of the original material and the follow-up material in a process related to material management, such as a follow-up purchase order or a material substitution scenario. This error typically arises in the context of material master data management, particularly when dealing with material types and categories.
Cause: Material Category Mismatch: The original material and the follow-up material belong to different material categories. For example, one might be a finished product while the other is a raw material or a semi-finished product.
Configuration Issues: The system may be configured in such a way that it does not allow certain types of materials to be substituted or followed up with others that do not share the same category. Data Entry Errors: There may have been an error during data entry or material creation that led to the incorrect assignment of material
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