Message type: E = Error
Message class:  CNV_10020 - Message class for package 10020 
Message number: 794
Message text: Message number &1 does not exist in message class &2; check your input
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
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The SAP error message CNV_10020794 indicates that a specific message number does not exist in the specified message class. This error typically arises during data migration or conversion processes, particularly when using SAP's tools for data transfer or transformation.
Cause: Missing Message Definition: The message number you are trying to access is not defined in the specified message class. This could be due to a missing or incomplete configuration in the system. Incorrect Message Class or Number: There may be a typo or incorrect reference in the code or configuration that is trying to access the message. Transport Issues: If the message class was recently transported from another system, it may not have been transported correctly, leading to missing entries.
Solution: Check Message Class: Verify that the message class specified in the error message is correct. You can do this by using transaction code SE91 to view the message class and its entries. Define Missing Messages: If
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