Message type: E = Error
Message class:  CNV_12000 - Messages for shorttext and description conversion 
Message number: 005
Message text: New value for text &1 field &2 is &3
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The SAP error message CNV_12000005 typically occurs during data migration or conversion processes, particularly when using SAP's Data Migration tools or during the execution of a conversion program. This error indicates that there is an issue with the new value being assigned to a specific text field in the context of the conversion.
Cause: The error message CNV_12000005 can be caused by several factors, including: Data Format Issues: The new value being assigned to the text field may not conform to the expected format or length defined in the target structure. Invalid Data: The new value may not be valid according to the business rules or constraints defined in the system. Mapping Errors: There may be an issue with the mapping of source data to target fields, leading to incorrect or unexpected values being processed.
Configuration Issues: The configuration settings for the data migration process may not be set up correctly, leading to conflicts or errors
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