Message type: E = Error
Message class:  PPC1DM - PP Backflush: Database Management and Communication 
Message number: 028
Message text: The production version cannot be determined
The production version is required to determine the cost collector in
the ERP system. Either the production version has to be explicitly
transferred in the BAPI interface or it is determined via the iPPE
access node.
No production version could be determine using the transferred data
(iPPE header: &V1&).
The system rejects the backflush.
Contact your system administrator.
Fill in the VERSION field in the structure BAPI_PPC_APOHEADS if you know
the version.
Fill in the IPPE_HEADER field if you want the ERP system to determine
the production version. To do so, the system reads Table MKAL. Check
whether an entry exists for the transferred GUID.
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.
The SAP error message PPC1DM028, which states "The production version cannot be determined," typically occurs in the context of production planning and execution. This error indicates that the system is unable to find a valid production version for a material when trying to create a production order or perform related activities. Causes: Missing Production Version: The most common cause is that the production version for the material in question has not been defined in the system. Incorrect Material Master Data: The material master data may not be set up correctly, or the relevant views (like MRP or Work Scheduling) may not be maintained. Invalid Validity Dates: The production version may exist, but its validity dates may not cover the date of the production order or the current date.
Configuration Issues: There may be issues with the configuration of the production version determination process in the system. Missing BOM or Routing: If the Bill of Materials (BOM)
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