Message type: E = Error
Message class:  CNV_OT_APPL_PE - Messages for application specific functions 
Message number: 019
Message text: Open item &2/&3 in company code &1 is already cleared with document &4
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The SAP error message CNV_OT_APPL_PE019 indicates that there is an issue with open items in the context of data migration or conversion processes, particularly when dealing with financial documents in a company code. This error typically arises during the execution of a migration or conversion program, where the system detects that an open item has already been cleared with a specific document.
Cause: The error occurs when: An attempt is made to clear an open item that has already been cleared in the system with another document. There may be inconsistencies in the data being migrated, such as duplicate entries or incorrect mappings. The migration process is trying to process an open item that has already been addressed in a previous step or transaction.
Solution: To resolve this error, you can take the following steps: Check Document Status: Verify the status of the open item in question. Use transaction codes like FB03 to display the document and check
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