How To Fix USMD1504 - Mod./ent.&1, node ent.&2, hy.attr.fr.ref.&3: Invalid reference entity

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 504

• Message text: Mod./ent.&1, node ent.&2, hy.attr.fr.ref.&3: Invalid reference entity

What causes this issue?

Entity types without their own data elements cannot be used for the
<LS>Hierarchy Attribute from Reference</>.

System Response

The data model will not be saved or activated.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message USMD1504 - Mod./ent.&1, node ent.&2, hy.attr.fr.ref.&3: Invalid reference entity ?

  The SAP error message USMD1504 typically occurs in the context of SAP Master Data Governance (MDG) when there is an issue with the reference entity in a data model. This error indicates that there is an invalid reference to an entity that is expected to be present but is not found or is incorrectly defined.
  Cause:
  
  Missing Reference Entity: The entity that is being referenced does not exist in the system.
  Incorrect Configuration: The configuration of the data model may be incorrect, leading to references that do not point to valid entities.
  Data Inconsistency: There may be inconsistencies in the data that prevent the system from recognizing the reference entity.
  Transport Issues: If the data model or configuration was transported from another system, there may have been issues during the transport process that led to missing or incorrect references.
  
  Solution:
  
  Check Entity Existence: Verify that the referenced entity (node ent.&2) exists in the system. You can do this by checking the relevant tables or using transaction codes related to the data model.
  Review Configuration: Go through the configuration settings for the data model to ensure that all references are correctly defined. This includes checking the relationships between entities and ensuring that they are properly set up.
  Data Validation: Run data validation checks to identify any inconsistencies or errors in the data that may be causing the issue.
  Transport Review: If the issue arose after a transport, review the transport logs and ensure that all necessary objects were included and correctly transported.
  Consult Documentation: Refer to SAP documentation or notes related to the specific error message for additional guidance and troubleshooting steps.
  Debugging: If you have access to development tools, consider debugging the process to identify where the reference is failing.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  MDG Documentation: Review the Master Data Governance documentation for best practices in configuring and managing reference entities.
  
  If the issue persists after following these steps, it may be beneficial to reach out to SAP support for further assistance.