How To Fix FDT_EXPRESSIONS020 - No valid data object for the return value; boolean data object needed

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 020

• Message text: No valid data object for the return value; boolean data object needed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS020 - No valid data object for the return value; boolean data object needed ?

  The SAP error message FDT_EXPRESSIONS020 indicates that there is an issue with the return value of a function or expression in the context of the SAP Fiori or SAP UI5 applications, particularly when dealing with expressions in the FDT (Form Data Tool) or similar frameworks. The error specifically states that a valid data object is required for the return value, and it expects a boolean data object.
  Cause:
  
  Incorrect Data Type: The expression or function is expected to return a boolean value (true/false), but it is either returning a different data type or not returning any value at all.
  Missing Data Object: The data object that is supposed to hold the boolean value is not defined or is not accessible in the current context.
  Expression Logic Error: There may be a logical error in the expression that leads to an invalid return type.
  Configuration Issues: There might be issues in the configuration of the FDT or the data model that prevent the correct data object from being recognized.
  
  Solution:
  
  
  Check the Expression: Review the expression or function that is causing the error. Ensure that it is designed to return a boolean value. If it is supposed to return a boolean, verify that all branches of the logic return a boolean.
  
  
  Define Data Object: Ensure that the data object intended to hold the boolean value is properly defined and accessible in the context where the expression is evaluated.
  
  
  Debugging: Use debugging tools to trace the execution of the expression and identify where the return value is not as expected. This can help pinpoint the exact location of the issue.
  
  
  Review Configuration: Check the configuration settings in the FDT or related tools to ensure that all necessary data objects are correctly set up and linked.
  
  
  Consult Documentation: Refer to SAP documentation or community forums for specific guidance related to the FDT and boolean expressions. There may be known issues or additional configuration steps required.
  
  
  Testing: After making changes, thoroughly test the expression to ensure that it now returns a valid boolean value and that the error no longer occurs.
  
  
  Related Information:
  
  SAP Fiori and UI5 Documentation: Review the official SAP documentation for Fiori and UI5, which may provide insights into handling expressions and data types.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can provide solutions or workarounds.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide patches or updates that could resolve the issue.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.