Message type: E = Error
Message class:  USMD5 - Master Data: Workflow 
Message number: 037
Message text: Action not possible because validation is still running
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The SAP error message USMD5037 indicates that an action cannot be performed because a validation process is still running in the system. This error typically occurs in the context of SAP Master Data Governance (MDG) when you attempt to execute an action (like saving or changing data) while a validation process is still active.
Cause: Ongoing Validation Process: The most common cause of this error is that a validation process is currently being executed for the same data or object you are trying to modify. This can happen if: A previous validation was initiated and has not yet completed. There are multiple users or processes trying to validate or change the same data simultaneously. Long-running Validation: Sometimes, validations can take longer than expected due to large datasets or complex validation rules, leading to this error.
Solution: Wait for Validation to Complete: The simplest solution is to wait until the ongoing validation process finishes. You can check the
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