How To Fix FDT_EXPRESSIONS031 - Invalid boolean string; unknown tokens in &1

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 031

• Message text: Invalid boolean string; unknown tokens in &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS031 - Invalid boolean string; unknown tokens in &1 ?

  The SAP error message FDT_EXPRESSIONS031 indicates that there is an issue with a boolean expression in your SAP system. Specifically, the error message states that there are "unknown tokens" in the boolean string you are trying to use. This typically occurs in the context of using expressions in the SAP Fiori or SAP S/4HANA environments, particularly when working with Field Data Tool (FDT) or similar functionalities.
  Cause:
  
  Syntax Errors: The boolean expression may contain syntax errors, such as incorrect operators, missing parentheses, or unsupported functions.
  Unknown Tokens: The expression may include tokens (variables, fields, or functions) that are not recognized by the system. This could be due to typos or using fields that are not available in the current context.
  Unsupported Features: The expression might be using features or functions that are not supported in the version of SAP you are using.
  
  Solution:
  
  Check Syntax: Review the boolean expression for any syntax errors. Ensure that all operators and parentheses are correctly placed.
  Validate Tokens: Verify that all tokens used in the expression are valid and recognized by the system. Check for typos or incorrect field names.
  Use Supported Functions: Ensure that you are using functions and features that are supported in your version of SAP. Refer to the documentation for the specific version you are using.
  Test in Isolation: If possible, isolate parts of the expression and test them individually to identify which part is causing the error.
  Consult Documentation: Refer to the SAP documentation or help resources for guidance on constructing valid boolean expressions.
  Debugging Tools: Use debugging tools or logs to get more information about the context in which the error occurs.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Community Forums: Look for discussions in SAP Community forums where other users may have encountered similar issues.
  SAP Help Portal: Utilize the SAP Help Portal for detailed documentation on expressions and the Field Data Tool.
  
  If the issue persists after trying the above solutions, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.