Message type: E = Error
Message class:  FI - TR-FM Funds Management 
Message number: 999
Message text: Active items successfully converted
The internal numbers in the commitment items were converted
successfully.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FI999 "Active items successfully converted" typically indicates that there has been a successful conversion of active items in the Financial Accounting (FI) module. This message is not an error in the traditional sense but rather an informational message that confirms that the conversion process has been completed successfully.
Cause: The message FI999 is usually triggered during processes such as: Data migration or conversion activities, where active items (like open invoices, payments, etc.) are being transferred from one system to another or from one version of SAP to another. Running specific programs or transactions that handle the conversion of financial data.
Solution: Since FI999 is an informational message, there is generally no action required if you see this message. However, if you are expecting an error or if the conversion did not yield the expected results, consider the following steps: Verify Conversion Results: Check the logs or reports generated during the conversion process to
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