How To Fix BRF659 - Conversion of expression &1 is not possible; expression is inconsistent

SAP Error Message - Details

• Message type: E = Error

• Message class: BRF - Messages for Business Rule Framework

• Message number: 659

• Message text: Conversion of expression &1 is not possible; expression is inconsistent

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message BRF659 - Conversion of expression &1 is not possible; expression is inconsistent ?

  The SAP error message BRF659, which states "Conversion of expression &1 is not possible; expression is inconsistent," typically occurs in the context of Business Rule Framework (BRF+) when there is an issue with the expression or rule definition that is being evaluated. Here’s a breakdown of the potential causes, solutions, and related information for this error:
  Causes:
  
  
  Inconsistent Data Types: The expression may involve data types that are incompatible with each other. For example, trying to perform arithmetic operations on strings or using a string in a numeric context.
  
  
  Missing or Incorrect Parameters: If the expression references parameters or variables that are not defined or are incorrectly defined, it can lead to inconsistencies.
  
  
  Logical Errors in Expressions: The logic used in the expression may be flawed, such as using operators or functions that do not align with the expected input types.
  
  
  Invalid Function Calls: If the expression includes function calls that are not valid or do not return the expected type, this can cause the error.
  
  
  Versioning Issues: If there have been changes to the rules or expressions and the system is not updated accordingly, it may lead to inconsistencies.
  
  
  Solutions:
  
  
  Review the Expression: Check the expression referenced in the error message. Ensure that all data types are compatible and that the logic is sound.
  
  
  Check Parameter Definitions: Verify that all parameters used in the expression are correctly defined and initialized. Ensure that they are of the expected data types.
  
  
  Debugging: Use the debugging tools available in BRF+ to step through the expression evaluation. This can help identify where the inconsistency arises.
  
  
  Test with Sample Data: Run the expression with sample data to see if it produces the expected results. This can help isolate the issue.
  
  
  Consult Documentation: Refer to the SAP documentation for BRF+ to understand the expected input and output types for the functions and operators being used.
  
  
  Update or Recreate Rules: If the issue persists, consider updating or recreating the rules or expressions that are causing the error.
  
  
  Related Information:
  
  
  BRF+ Documentation: SAP provides extensive documentation on the Business Rule Framework, which can be helpful in understanding how to define and troubleshoot rules and expressions.
  
  
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered similar issues.
  
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or bugs related to BRF+ and the specific error message.
  
  
  Version Compatibility: Ensure that your SAP system is up to date, as certain bugs may have been fixed in later versions.
  
  
  By following these steps, you should be able to identify and resolve the cause of the BRF659 error in your SAP system.