How To Fix BRF658 - System unable to interpret parts of the expression '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: BRF - Messages for Business Rule Framework

• Message number: 658

• Message text: System unable to interpret parts of the expression '&1'

What causes this issue?

Expression &v1& contains elements that the system is unable to
interpret.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Perform one of the following activities:
Change expression &v1& so that these elements are no longer used.
Create the expression manually in the Formula & Derivation Tool (FDT).

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BRF658 - System unable to interpret parts of the expression '&1' ?

  The SAP error message BRF658, which states "System unable to interpret parts of the expression '&1'," typically occurs in the context of Business Rule Framework (BRF) when there is an issue with the expression or rule definition that the system is trying to evaluate. Here’s a breakdown of the potential causes, solutions, and related information for this error:
  Causes:
  
  Syntax Errors: There may be a syntax error in the expression or rule definition. This could include missing operators, incorrect function calls, or improperly formatted expressions.
  Invalid Data Types: The expression may be using data types that are incompatible with the expected input or output types.
  Missing Variables or Constants: The expression might reference variables or constants that are not defined or are incorrectly referenced.
  Logical Errors: There could be logical errors in the way the expression is constructed, leading to an inability for the system to interpret it correctly.
  Versioning Issues: If there have been recent changes to the rules or expressions, there may be versioning issues that cause the system to fail to interpret the latest changes.
  
  Solutions:
  
  Review the Expression: Check the expression for any syntax errors or logical inconsistencies. Ensure that all operators and functions are used correctly.
  Check Data Types: Verify that the data types used in the expression are compatible. If necessary, convert data types to match expected formats.
  Define Missing Elements: Ensure that all variables, constants, and functions referenced in the expression are properly defined and accessible.
  Test in Isolation: If possible, isolate the expression and test it independently to identify the specific part that is causing the issue.
  Consult Documentation: Refer to SAP documentation or help resources for guidance on the specific functions or expressions being used.
  Debugging Tools: Utilize debugging tools available in the BRF environment to trace the execution and identify where the interpretation fails.
  Seek Support: If the issue persists, consider reaching out to SAP support or consulting with a colleague who has experience with BRF.
  
  Related Information:
  
  BRF Documentation: SAP provides extensive documentation on the Business Rule Framework, including guidelines on creating and managing rules and expressions.
  SAP Community: Engaging with the SAP Community can provide insights from other users who may have encountered similar issues.
  Transaction Codes: Familiarize yourself with relevant transaction codes (like BRF+ or BRF transaction codes) that can help you navigate the BRF environment more effectively.
  
  By following these steps, you should be able to diagnose and resolve the BRF658 error in your SAP system.