Message type: E = Error
Message class:  USMD_CONV_SOM_GOV - Messages from the Convenience API 
Message number: 010
Message text: Change request creation not possible as change request &1 already exists
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The SAP error message USMD_CONV_SOM_GOV010 indicates that a change request cannot be created because a change request with the same identifier (denoted as &1) already exists in the system. This typically occurs in the context of SAP Master Data Governance (MDG) when trying to create a new change request for a master data object.
Cause: Duplicate Change Request: The most common cause of this error is that a change request with the same identifier is already in the system. This can happen if: A user is attempting to create a change request that has already been initiated. There is a system error or a transaction that did not complete properly, leaving a change request in an incomplete state. Multiple users are trying to create change requests for the same object simultaneously.
Solution: To resolve this error, you can take the following steps: Check Existing Change Requests: Use transaction codes like MDG_MAT (for material) or MDG_BP (for business partner) to
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