How To Fix FDT_EXPRESSIONS657 - Source step &1 for mapping is not defined in sequence

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 657

• Message text: Source step &1 for mapping is not defined in sequence

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS657 - Source step &1 for mapping is not defined in sequence ?

  The SAP error message FDT_EXPRESSIONS657 indicates that there is an issue with the mapping configuration in your SAP Data Services or SAP Data Intelligence environment. Specifically, it means that a source step referenced in a mapping sequence is not defined or recognized.
  Cause:
  
  Missing Source Step: The source step that is being referenced in the mapping sequence does not exist or has been deleted.
  Incorrect Mapping Configuration: The mapping may have been incorrectly configured, leading to references to non-existent steps.
  Changes in Data Flow: If there have been recent changes to the data flow or mapping, it may have resulted in broken references.
  Versioning Issues: If multiple versions of the mapping exist, the one being executed may not have the correct source step defined.
  
  Solution:
  
  
  Check Mapping Configuration:
  
  Open the mapping in the Data Services Designer or relevant tool.
  Verify that all source steps referenced in the mapping are correctly defined and exist in the sequence.
  
  
  
  Recreate Missing Steps:
  
  If a source step is missing, recreate it or restore it from a backup if available.
  
  
  
  Update References:
  
  If the mapping has been modified, ensure that all references to source steps are updated accordingly.
  
  
  
  Validate the Mapping:
  
  Use the validation feature in the Data Services Designer to check for any other issues in the mapping.
  
  
  
  Check for Version Conflicts:
  
  Ensure that you are working with the correct version of the mapping. If necessary, revert to a previous version that is known to work.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific guidance on mapping configurations and troubleshooting.
  
  
  
  Related Information:
  
  SAP Data Services Documentation: Check the official SAP documentation for Data Services for detailed information on mapping and data flow configurations.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they found.
  SAP Notes: Search for relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  By following these steps, you should be able to identify and resolve the issue causing the FDT_EXPRESSIONS657 error message.