How To Fix FDT_EXPRESSIONS684 - Result of function &1 in step &2 is not of type element or structure

FDT_EXPRESSIONS684 - Overview

• Message type: E = Error

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

• Message number: 684

• Message text: Result of function &1 in step &2 is not of type element or structure

What causes this issue?

In the current step sequence, you have inserted function &v1& as step
&v2&. This function returns a table as its result data object. However,
functions used in a step sequence expression must return either an
element or a structure data object.

System Response

The object cannot be activated.

How to fix this error?

Make sure that all functions used in a step sequence expression have
either an element or a structure assigned as result data object.

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.

FDT_EXPRESSIONS684 - Details

• The SAP error message FDT_EXPRESSIONS684 indicates that there is an issue with the data type of the result returned by a function in a specific step of a process. Specifically, the error states that the result of the function (denoted as &1) in step &2 is not of the expected type, which should be either an element or a structure.
  
  Cause:
  This error typically arises in the context of using expressions or functions in SAP's Field-Based Data Transformation (FDT) or similar data processing scenarios. The most common causes include:
  
  
  Incorrect Function Return Type: The function being called is returning a data type that is not compatible with what is expected in that step. For example, it might be returning a primitive type (like a string or integer) instead of a structured type.
  
  
  Misconfiguration: There may be a misconfiguration in the data transformation logic where the expected output type does not match the actual output