How To Fix FMCA_BRF133 - The result type of expression &1 must be Boolean

SAP Error Message - Details

• Message type: E = Error

• Message class: FMCA_BRF - FMCA -> BRF Interface

• Message number: 133

• Message text: The result type of expression &1 must be Boolean

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FMCA_BRF133 - The result type of expression &1 must be Boolean ?

  The SAP error message FMCA_BRF133, which states "The result type of expression &1 must be Boolean," typically occurs in the context of Business Rule Framework (BRF+) when a condition or expression is expected to return a Boolean value (true or false), but it is returning a different type of value.
  Cause:
  
  Incorrect Expression Type: The expression defined in the rule is not returning a Boolean value. For example, it might be returning a string, number, or another data type instead of a Boolean.
  Logical Errors: There may be logical errors in the way the expressions are constructed, leading to a non-Boolean result.
  Data Type Mismatch: The data types used in the expression may not be compatible with the expected Boolean output.
  
  Solution:
  
  
  Check the Expression: Review the expression that is causing the error. Ensure that it is designed to return a Boolean value. For example, if you are using a comparison operator (like =, >, <), ensure that it is correctly set up to evaluate to true or false.
  
  
  Use Boolean Functions: If necessary, use functions that explicitly return Boolean values. For example, you can use functions like IS_NULL, IS_EMPTY, or logical operators (AND, OR, NOT) to ensure the expression evaluates to a Boolean.
  
  
  Debugging: Utilize the debugging tools available in BRF+ to step through the logic and see what values are being returned at each step. This can help identify where the logic is failing.
  
  
  Review Data Types: Ensure that all variables and constants used in the expression are of the correct data type. If you are comparing different types, consider converting them to a common type that can be evaluated correctly.
  
  
  Consult Documentation: Refer to the SAP documentation for BRF+ to understand the expected data types and how to construct expressions correctly.
  
  
  Related Information:
  
  BRF+ Documentation: SAP provides extensive documentation on the Business Rule Framework, which can be helpful in understanding how to construct rules and expressions correctly.
  SAP Community: Engaging with the SAP Community can provide insights from other users who may have encountered similar issues.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues or bugs related to the error message.
  
  By following these steps, you should be able to resolve the FMCA_BRF133 error and ensure that your expressions return the expected Boolean values.