Message type: E = Error
Message class:  CNVA_10520_CHECK - Messages for FI-CA (DFKKSUM) checks 
Message number: 001
Message text: Contract Accounts Receivable and Payable (FI-CA) is in use.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNVA_10520_CHECK001 typically indicates that there is an issue related to the Contract Accounts Receivable and Payable (FI-CA) module, specifically that a certain operation cannot be performed because the FI-CA is currently in use or locked by another process. This can occur in various scenarios, such as during data processing, posting, or when trying to execute certain transactions.
Cause: Concurrent Access: The error often arises when multiple users or processes are trying to access or modify the same FI-CA data simultaneously. Open Sessions: There may be open sessions or transactions that are still processing, which can lock the data. Background Jobs: Background jobs that are running and accessing the FI-CA data can also lead to this error. System Lock: The system may have a lock on the FI-CA data due to a previous transaction that did not complete successfully.
Solution: Check for Locks: Use transaction code SM12 to check for any locks on the
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