Message type: E = Error
Message class:  CNV_10020 - Message class for package 10020 
Message number: 633
Message text: Proxy &1 in proxy &2 undefined
For the given proxy &V2& in package &V3&, the definition refers to
another proxy that is undefined (&V1&).
Define the proxy &V1& and its value using transaction CNV_10020_PROXYF.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV_10020633, which states "Proxy &1 in proxy &2 undefined," typically occurs in the context of data migration or conversion processes, particularly when using the SAP Landscape Transformation (SLT) or SAP Data Services. This error indicates that there is a reference to a proxy object that is not defined or recognized in the system.
Cause: Undefined Proxy Objects: The error usually arises when the system is trying to access a proxy object (like a data structure or mapping) that has not been defined or is not available in the current context.
Configuration Issues: There may be issues with the configuration of the data migration or transformation process, such as missing or incorrect settings. Transport Issues: If the proxies were supposed to be transported from another system and the transport did not include all necessary objects, this error can occur. Version Mismatch: There may be a version mismatch between the source and target
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