How To Fix FDT_EXPRESSIONS686 - Result of function &1 in step &2 might not be convertible to WA value

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 686

• Message text: Result of function &1 in step &2 might not be convertible to WA value

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS686 - Result of function &1 in step &2 might not be convertible to WA value ?

  The SAP error message FDT_EXPRESSIONS686 indicates that there is an issue with the result of a function in a specific step of a process not being convertible to a "WA" (Work Area) value. This typically occurs in the context of SAP's Flexible Data Import (FDI) or similar data processing scenarios where data types and conversions are critical.
  
  Cause:
  
  Data Type Mismatch: The function in question is returning a value that does not match the expected data type for the Work Area. For example, if the function is expected to return a numeric value but returns a string or a complex object, this error can occur.
  Null or Undefined Values: If the function returns a null or undefined value, it may not be convertible to the expected format.
  Incorrect Function Logic: The logic within the function may not be correctly implemented, leading to unexpected results that cannot be converted.
  
  Configuration Issues: There may be issues with