How To Fix FDT_EXPRESSIONS003 - Recursion with expression &1

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 003

• Message text: Recursion with expression &1

What causes this issue?

The system has detected that in the definition of expression &v1&, there
is a reference to that very expression. The reference is such that it
leads to an infinite recursion. This is not permitted.
Examples of typical cases of an unallowed self-reference:
The calculated result of an expression is assigned to the same
expression.
In a Boolean expression, the expression is used for a condition in its
own definition.

System Response

The expression cannot be activated.

How to fix this error?

Replace the self-reference in the expression definition by a reference
to a different expression or data object of the same type.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS003 - Recursion with expression &1 ?

  The SAP error message FDT_EXPRESSIONS003 indicates that there is a recursion issue with an expression in the context of the Flexible Data Import (FDI) or Flexible Data Transfer (FDT) framework. This error typically occurs when an expression references itself directly or indirectly, leading to an infinite loop during evaluation.
  Cause:
  
  Self-Referencing Expression: The expression is defined in such a way that it refers back to itself.
  Indirect Recursion: The expression may reference another expression that, in turn, references the original expression, creating a circular dependency.
  Complex Logic: The logic defined in the expression may be too complex, leading to unintended recursion.
  
  Solution:
  
  Review the Expression: Check the expression that is causing the error. Look for any self-references or circular dependencies.
  Simplify Logic: If the expression is complex, try to simplify it. Break it down into smaller, more manageable parts that do not reference each other.
  Use Intermediate Variables: If necessary, use intermediate variables to store results of calculations instead of referencing the same expression multiple times.
  Testing: After making changes, test the expression to ensure that it no longer causes recursion and behaves as expected.
  Documentation: Refer to SAP documentation or community forums for best practices on defining expressions to avoid recursion.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide guidance on best practices for expressions in FDT.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed.
  Debugging Tools: Utilize debugging tools within SAP to trace the execution of the expression and identify where the recursion occurs.
  
  By addressing the recursion in the expression, you should be able to resolve the error and ensure that your data transfer processes function correctly.