How To Fix USMD1A004 - Data model &1: Entity type &2 is unknown in data persistence

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1A - Messages: Abstraction Layer

• Message number: 004

• Message text: Data model &1: Entity type &2 is unknown in data persistence

What causes this issue?

The active version of data model &V1& is not synchronous with the
generated persistence layer.

System Response

The saved data cannot be accessed.

How to fix this error?

Contact technical support.

Procedure for System Administrators

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.

Smart SAP Assistant

• What is the cause and solution for SAP error message USMD1A004 - Data model &1: Entity type &2 is unknown in data persistence ?

  The SAP error message USMD1A004 indicates that there is an issue with the data model in the context of SAP Master Data Governance (MDG). Specifically, the error states that the entity type specified is unknown in the data persistence layer. This typically occurs when the system cannot find the definition of the entity type in the underlying database or data model.
  Causes:
  
  Missing Entity Definition: The entity type referenced in the error message may not be defined in the data model or may have been deleted or not activated.
  Incorrect Configuration: There may be a misconfiguration in the data model or the persistence layer that prevents the system from recognizing the entity type.
  Transport Issues: If the data model was recently transported from another system, there may have been issues during the transport process that led to missing or incomplete definitions.
  Version Mismatch: The version of the data model in the system may not match the expected version, leading to discrepancies in entity definitions.
  
  Solutions:
  
  
  Check Data Model Configuration:
  
  Go to the MDG data model configuration and verify that the entity type mentioned in the error message is correctly defined and activated.
  Ensure that all necessary fields and relationships for the entity type are properly configured.
  
  
  
  Activate the Data Model:
  
  If the entity type is newly created or modified, ensure that the data model is activated. You can do this in the MDG customizing settings.
  
  
  
  Review Transport Requests:
  
  If the issue arose after a transport, check the transport logs for any errors or warnings. Ensure that all necessary objects were included in the transport request.
  If needed, re-transport the data model or manually adjust the definitions in the target system.
  
  
  
  Check for Version Compatibility:
  
  Ensure that the version of the data model in your system is compatible with the version of the MDG application you are using. If there are discrepancies, consider updating or aligning the versions.
  
  
  
  Debugging:
  
  If the above steps do not resolve the issue, consider debugging the process to identify where the system is failing to recognize the entity type. This may involve looking at the ABAP code or the persistence layer.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the error message USMD1A004 for any specific patches or updates that may address the issue.
  MDG Documentation: Review the official SAP documentation for Master Data Governance to understand the data model structure and entity definitions.
  Community Forums: Engage with SAP community forums or support channels where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify and resolve the issue related to the USMD1A004 error message in SAP MDG.