Message type: E = Error
Message class:  USMDZ10 - Message Class for MDG-F BOL/genIL UI related texts 
Message number: 042
Message text: Account &1 already exists in edition &2.
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The SAP error message USMDZ10042 indicates that there is an attempt to create or modify an account that already exists in a specific edition. This error typically arises in the context of SAP Master Data Governance (MDG) when dealing with master data records.
Cause: The error occurs when: You are trying to create a new account (e.g., a customer or vendor) that has the same unique identifier (like an account number) as an existing account in the specified edition. The system enforces uniqueness for certain fields, and the account you are trying to create or modify conflicts with an existing record.
Solution: To resolve this error, you can take the following steps: Check Existing Records: Use the relevant transaction code (like SE16 or SE11) to check the database table where the account records are stored (e.g., KNA1 for customers, LFA1 for vendors). Search for the account number or identifier you are trying to create to confirm that it already
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