Message type: E = Error
Message class:  CNV_10020 - Message class for package 10020 
Message number: 037
Message text: Elementary relationship &1: Spec. function module &2 does not exist
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The SAP error message CNV_10020037 typically indicates that there is an issue with a specific function module that is expected to exist but cannot be found in the system. This error is often encountered during data migration or conversion processes, particularly when using SAP's Conversion Tools or during the execution of specific programs related to data transformation.
Cause: Missing Function Module: The function module specified in the error message (&2) does not exist in the SAP system. This could be due to: The function module not being activated or created. The function module being deleted or not transported correctly from a development environment to the production environment. A typo in the function module name or incorrect configuration. Incorrect Configuration: The configuration settings for the data migration or conversion process may be incorrect, leading to the system looking for a function module that is not relevant or does not exist. Version Mismatch: If you are using a version
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