How To Fix FDT_EXPRESSIONS318 - Object &1 (&2) does not return a value of elementary type

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 318

• Message text: Object &1 (&2) does not return a value of elementary type

What causes this issue?

For the current e-mail action, you have defined a reference to object
&v1& (&v2&). This object returns a value of non-elementary type (for
example, a structure or a table). However, this is not permitted here.
For the intended usage, the object must return a value of type element
(number, text, etc.).

System Response

The element cannot be activated.

How to fix this error?

Replace object &v1& by an object returning a value of elementary 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_EXPRESSIONS318 - Object &1 (&2) does not return a value of elementary type ?

  The SAP error message FDT_EXPRESSIONS318 indicates that there is an issue with an expression in your SAP system that is expected to return a value of an elementary type, but it is not doing so. This typically occurs in the context of using the SAP Fiori or SAP S/4HANA applications where expressions are evaluated, such as in the context of Field-Based Data Transformation (FDT) or similar functionalities.
  Cause:
  The error can be caused by several factors:
  
  Incorrect Data Type: The expression you are using is returning a complex type (like a structure or a table) instead of a simple or elementary type (like string, integer, etc.).
  Function Return Type: If you are calling a function or method, it may be returning a type that is not compatible with what is expected.
  Expression Logic: The logic in the expression may be flawed, leading to a return type that does not match the expected elementary type.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  Check the Expression: Review the expression that is causing the error. Ensure that it is designed to return an elementary type. If it is returning a complex type, modify it to extract the necessary elementary value.
  Debugging: Use debugging tools to step through the code and identify where the expression is evaluated. This can help you understand what type is being returned.
  Function Return Types: If you are using a function or method, check its definition to ensure it is returning the expected type. If necessary, modify the function to return an elementary type.
  Type Casting: If you are certain that the expression can yield an elementary type, consider using type casting to convert the result to the expected type.
  Documentation: Refer to the SAP documentation for the specific context in which you are working to understand the expected types and how to handle them.
  
  Related Information:
  
  Elementary Types: In SAP, elementary types include basic data types like CHAR, NUMC, INT, FLOAT, etc. Ensure that your expressions are returning one of these types.
  Debugging Tools: Familiarize yourself with SAP debugging tools, such as the ABAP Debugger, to trace the execution of your code and inspect variable types.
  SAP Notes: Check SAP Notes and Knowledge Base Articles (KBAs) for any known issues or patches related to the error message FDT_EXPRESSIONS318.
  Community Forums: Engage with SAP community forums or SAP support for additional insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.