How To Fix USMD1591 - Model &1, ent.type &2: Only 1 foreign key relationship for attribute &3

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 591

• Message text: Model &1, ent.type &2: Only 1 foreign key relationship for attribute &3

What causes this issue?

You have specified the attribute &V2& as a key field. Such attributes
must occur in only one foreign key relationship.

System Response

The data model cannot be saved or activated.

How to fix this error?

Edit the fields in the <LS>Fields of Foreign Key Relationships</> view
in Customizing activity <DS:SIMG.FMDM_USMD001>Edit Data Model</>.

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 USMD1591 - Model &1, ent.type &2: Only 1 foreign key relationship for attribute &3 ?

  The SAP error message USMD1591 typically occurs in the context of SAP Master Data Governance (MDG) when there is an issue with the configuration of foreign key relationships in the data model. This error indicates that there is an attempt to define more than one foreign key relationship for a specific attribute, which is not allowed.
  Cause:
  The error message "Only 1 foreign key relationship for attribute &3" suggests that:
  
  The attribute in question (denoted by &3) is configured to have multiple foreign key relationships, but the system only allows one.
  This can happen due to incorrect configuration in the data model or when trying to map multiple relationships to a single attribute.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Data Model Configuration:
  
  Go to the data model configuration in SAP MDG.
  Identify the attribute (denoted by &3) that is causing the issue.
  Review the foreign key relationships defined for this attribute.
  
  
  
  Modify Foreign Key Relationships:
  
  Ensure that only one foreign key relationship is defined for the attribute. If there are multiple relationships, you will need to decide which one to keep and remove the others.
  If necessary, create a new attribute to accommodate the additional foreign key relationships instead of trying to assign them to the same attribute.
  
  
  
  Test Changes:
  
  After making the necessary changes, test the data model to ensure that the error no longer occurs and that the relationships function as expected.
  
  
  
  Documentation and Backup:
  
  Document any changes made to the data model for future reference.
  It’s a good practice to back up the current configuration before making changes.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might provide additional insights or updates related to this error.
  MDG Documentation: Review the official SAP MDG documentation for guidelines on configuring data models and foreign key relationships.
  Community Forums: Consider searching or posting in SAP community forums for additional insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the USMD1591 error and ensure that your data model is correctly configured.