Message type: E = Error
Message class:  CNV_OT_APPL_PE - Messages for application specific functions 
Message number: 013
Message text: Field symbol assignment for structure &1 failed
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The SAP error message CNV_OT_APPL_PE013 indicates that there is a problem with field symbol assignment for a structure in the context of a data conversion or migration process. This error typically arises during the execution of a conversion program, particularly when the program attempts to assign a field symbol to a structure that is not compatible or does not exist.
Cause: Incompatible Structure: The structure being referenced may not match the expected format or may not be defined in the program. Field Symbol Not Initialized: The field symbol may not have been properly initialized before the assignment attempt. Data Type Mismatch: There could be a mismatch in data types between the field symbol and the structure. Program Logic Error: There may be a logical error in the program that leads to an invalid assignment.
Solution: Check Structure Definition: Verify that the structure being referenced in the error message is correctly defined in the program. Ensure that it
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