Message type: E = Error
Message class:  USMD6 - Messages for Data Transfer 
Message number: 577
Message text: &1 &2 already assigned to change request &3 with edition &4
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The SAP error message USMD6577 indicates that a specific object (like a business partner, role, or other entity) is already assigned to a change request in the system. This typically occurs in the context of SAP Master Data Governance (MDG) when trying to assign an object that is already linked to another change request.
Cause: The error arises when: You attempt to assign an object (e.g., a business partner) to a new change request while it is still associated with an existing change request. The object is locked for changes because it is being processed in another change request.
Solution: To resolve this error, you can take the following steps: Check Existing Change Requests: Identify the change request that the object is currently assigned to (as indicated in the error message). You can do this by navigating to the change request management area in SAP MDG and looking for the specific object. Release or Complete the Existing Change Request: If the
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