How To Fix USMD1258 - Data model &1: namespace/prefix for structure generation not valid

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 258

• Message text: Data model &1: namespace/prefix for structure generation not valid

What causes this issue?

Prefix/namespace is filled with a non valid entry. You have chosen a
different entry for the prefix/namespace than in Customizing activity
<DS:SIMG.MDG_VC_USMD004_0>Data Model-Specific Structures</>.

System Response

Data model-specific structures are not generated automatically.

How to fix this error?

For automatic data model specific structure generation, use the same
prefix/namespace as in Customizing activity <LS>Data Model-Specific
Structures</>.

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 USMD1258 - Data model &1: namespace/prefix for structure generation not valid ?

  The SAP error message USMD1258 indicates that there is an issue with the namespace or prefix used for structure generation in the context of a data model. This error typically arises in the SAP Master Data Governance (MDG) environment when the system is unable to recognize or validate the namespace or prefix specified for a data model.
  Cause:
  
  Invalid Namespace/Prefix: The namespace or prefix defined in the data model is not valid or does not conform to the expected format.
  Configuration Issues: There may be configuration issues in the MDG settings that lead to the namespace/prefix not being recognized.
  Missing Entries: The required entries for the namespace or prefix may be missing in the relevant configuration tables.
  Transport Issues: If the data model was transported from another system, there may be inconsistencies or missing configurations in the target system.
  
  Solution:
  
  Check Namespace/Prefix: Verify that the namespace and prefix used in the data model are correctly defined. Ensure they follow the naming conventions and are valid.
  Configuration Review: Review the configuration settings in the MDG system to ensure that the namespace/prefix is properly set up. This can be done in the MDG customizing settings.
  Maintain Entries: If necessary, maintain the required entries in the relevant configuration tables (e.g., TMDG_MDL for data models) to ensure that the namespace/prefix is recognized.
  Transport Validation: If the issue arose after a transport, check the transport logs and ensure that all necessary objects and configurations were transported correctly.
  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 Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  MDG Customizing: Familiarize yourself with the MDG customizing settings, particularly those related to data model configuration.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Support: If the issue persists, consider reaching out to SAP Support for assistance, providing them with detailed information about the error and the steps you have already taken.
  
  By following these steps, you should be able to identify and resolve the issue related to the USMD1258 error message in your SAP MDG environment.