How To Fix USMD1B001 - Data model &1: Persistence layer needs to be regenerated

USMD1B001 - Overview

• Message type: E = Error

• Message class: USMD1B - Meldungen: MDF Anschluss

• Message number: 001

• Message text: Data model &1: Persistence layer needs to be regenerated

What causes this issue?

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

System Response

How to fix this error?

Activate the data model or import it from the development system or test
system.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

USMD1B001 - Details

• The SAP error message USMD1B001 indicates that the persistence layer of a data model needs to be regenerated. This typically occurs in the context of SAP Master Data Governance (MDG) when there are changes made to the data model, such as adding or modifying fields, or when the underlying database structure has changed.
  
  Cause:
  
  Changes in Data Model: If there have been changes to the data model (like adding new fields or changing existing ones), the persistence layer must be updated to reflect these changes.
  Database Structure Changes: If the underlying database structure has been modified, the persistence layer may also need to be regenerated.
  System Upgrades or Patches: Sometimes, after applying upgrades or patches, the persistence layer may become outdated and require regeneration.
  
  
  Solution:
  To resolve the error, you need to regenerate the persistence layer for the affected data model. Here are the steps to do this:
  
  Access the Data Model: Go to the relevant transaction