Message type: E = Error
Message class:  FMCY - Copy budget data 
Message number: 051
Message text: CO plan values were already transfered. Check table FMBUCOPI for details.
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The SAP error message FMCY051 indicates that the cost plan values for a particular cost object have already been transferred, and it suggests checking the table FMBUCOPI for more details. This error typically occurs in the context of controlling (CO) and financial planning processes within SAP.
Cause: Duplicate Transfer: The most common cause of this error is an attempt to transfer cost planning values that have already been transferred to the system. This can happen if the transfer process is executed multiple times for the same planning version or cost object. Incorrect Planning Version: If the planning version being used is not set up correctly or if it has already been processed, it may lead to this error. Data Integrity Issues: There may be issues with the data integrity in the planning tables, leading to inconsistencies that trigger this error.
Solution: Check Table FMBUCOPI: As suggested in the error message, check the table FMBUCOPI to see
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