How To Fix USMD1534 - Data model &1, entity type &2: Type of key assignment changed

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 534

• Message text: Data model &1, entity type &2: Type of key assignment changed

What causes this issue?

Data model &V1& is already active and entity type &V2& is contained in
the active version. In this case, you may no longer change the type of
key assignment for entity type &V2&.

System Response

The system cannot activate data model &V1&.

How to fix this error?

Reset the type of key assignment for entity type &V2& in data model &V1&
to #&V3&&V4&#.

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 USMD1534 - Data model &1, entity type &2: Type of key assignment changed ?

  The SAP error message USMD1534 typically occurs in the context of SAP Master Data Governance (MDG) when there is an inconsistency in the key assignment type for a specific entity type in a data model. This error indicates that the type of key assignment for the specified entity has changed, which can lead to issues in data consistency and integrity.
  Cause:
  
  Change in Key Assignment: The key assignment type for an entity type has been modified in the data model. This could happen due to changes in the configuration or design of the data model.
  Inconsistent Data: Existing data may not conform to the new key assignment type, leading to conflicts when trying to process or validate the data.
  Model Versioning: If there are multiple versions of the data model, the error may arise from trying to use an outdated version that does not align with the current key assignment rules.
  
  Solution:
  
  Review Data Model Changes: Check the changes made to the data model, specifically the key assignment type for the entity in question. Ensure that the changes are intentional and correctly implemented.
  Data Consistency Check: Perform a consistency check on the existing data to identify any records that do not comply with the new key assignment type. You may need to correct or delete these records.
  Update Configuration: If the key assignment type was changed unintentionally, revert the changes in the data model configuration to restore the previous key assignment type.
  Data Migration: If the key assignment type has been changed as part of a planned migration or upgrade, ensure that all existing data is migrated to comply with the new key assignment rules.
  Consult Documentation: Refer to SAP documentation or notes related to the specific version of MDG you are using for any additional guidance or known issues related to this error.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or fixes related to this error message.
  MDG Configuration: Familiarize yourself with the configuration settings for key assignments in SAP MDG, as this will help in understanding how changes can impact data integrity.
  Testing: After making any changes, conduct thorough testing to ensure that the data model functions as expected and that the error does not reoccur.
  
  If the issue persists after following these steps, consider reaching out to SAP support for further assistance.