Message type: E = Error
Message class:  EZ - Print workbench 
Message number: 509
Message text: Error when inserting private data in form class library &1
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The SAP error message EZ509 typically occurs when there is an issue with inserting private data into a form class library. This error can arise due to various reasons, including incorrect data types, issues with the form class library configuration, or problems with the data being passed to the form.
Cause: Data Type Mismatch: The data being inserted may not match the expected data type defined in the form class library. Access Issues: There may be restrictions on accessing or modifying private data within the form class library. Incorrect Configuration: The form class library may not be properly configured to accept the data being inserted. Programming Errors: There could be errors in the ABAP code that is attempting to insert the data.
Solution: Check Data Types: Ensure that the data being inserted matches the expected data types defined in the form class library. You may need to convert or format the data appropriately. Review Access Modifiers: If the
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