How To Fix FDT_CORE391 - Invalid recursion: &1 uses &2 uses &1

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_CORE - Formula & Derivation Tool: Core

• Message number: 391

• Message text: Invalid recursion: &1 uses &2 uses &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_CORE391 - Invalid recursion: &1 uses &2 uses &1 ?

  The SAP error message FDT_CORE391 indicates an issue with recursion in the context of field definitions or data types in the SAP system. Specifically, the message states that an object (like a field or a data type) is referencing itself indirectly through another object, which creates a circular reference. This can lead to problems in processing or interpreting the data structure.
  Cause:
  The error occurs when:
  
  A field or data type (denoted as &1) is defined in such a way that it references another field or data type (denoted as &2), which in turn references the original field or data type (&1). This creates a loop or recursion that the system cannot resolve.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Identify the Fields/Data Types: Review the definitions of the fields or data types involved in the error message. Check the relationships and dependencies between them.
  
  
  Break the Recursion: Modify the definitions to eliminate the circular reference. This may involve:
  
  Changing the structure of the data types.
  Removing or altering the references that create the loop.
  Redefining the fields to ensure that they do not reference each other in a circular manner.
  
  
  
  Test Changes: After making the necessary adjustments, test the changes to ensure that the error no longer occurs and that the system behaves as expected.
  
  
  Consult Documentation: If you are unsure about how to modify the definitions, refer to SAP documentation or consult with a colleague who has experience with data definitions in SAP.
  
  
  Use Debugging Tools: If the issue persists, consider using debugging tools or transaction codes (like SE11 for data dictionary objects) to trace the definitions and find the source of the recursion.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Field Definition Guidelines: Familiarize yourself with best practices for defining fields and data types in SAP to avoid similar issues in the future.
  Community Forums: Engage with SAP community forums or user groups where you can ask questions and share experiences related to this error.
  
  By following these steps, you should be able to resolve the FDT_CORE391 error and prevent it from occurring in the future.