Message type: E = Error
Message class:  SEPMH_DG - EPM HANA DG - Messages 
Message number: 503
Message text: Invalid function name &1
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The SAP error message SEPMH_DG503 "Invalid function name &1" typically occurs in the context of SAP's Process Integration (PI) or Process Orchestration (PO) when there is an issue with the function name being called in a mapping or integration scenario. Here’s a breakdown of the potential causes, solutions, and related information for this error: Causes: Typographical Error: The function name specified in the mapping or configuration might contain a typo or incorrect syntax. Function Not Defined: The function you are trying to call may not be defined in the system or is not available in the context where it is being called. Incorrect Namespace: The function might be defined in a different namespace, and the system is unable to locate it. Version Mismatch: If you are using a function from a specific version of a library or module, ensure that the correct version is being referenced. Authorization Issues: The user executing the function may not have
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