How To Fix BRF446 - The result type of expression &1 must be Boolean

SAP Error Message - Details

• Message type: E = Error

• Message class: BRF - Messages for Business Rule Framework

• Message number: 446

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

What causes this issue?

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

System Response

How to fix this error?

If the rule line contains an action, the result type of the expression
must be Boolean.
The result of the expression decides whether the action is executed or
not.

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 BRF446 - The result type of expression &1 must be Boolean ?

  The SAP error message BRF446 indicates that there is an issue with the result type of an expression in a Business Rule Framework (BRF) rule. Specifically, it states that the expression must return a Boolean value (true or false), but it currently does not.
  Cause:
  The error typically arises in the following scenarios:
  
  Incorrect Expression Type: The expression you are using in your rule is expected to evaluate to a Boolean value, but it is returning a different type (e.g., a string, number, or object).
  Logical Conditions: If you are using logical operators (AND, OR, NOT), the expressions involved must evaluate to Boolean values.
  Function Return Types: If you are calling a function within the expression, ensure that the function is designed to return a Boolean value.
  
  Solution:
  To resolve the BRF446 error, you can take the following steps:
  
  
  Check Expression Logic: Review the expression that is causing the error. Ensure that it is structured to return a Boolean value. For example, if you are comparing two values, make sure you are using comparison operators (e.g., =, <>, <, >, etc.) that yield a Boolean result.
  
  
  Modify Functions: If you are using a custom function, verify that it is defined to return a Boolean value. If it currently returns a different type, you may need to adjust the function's logic.
  
  
  Use Boolean Functions: If necessary, use built-in Boolean functions or operators to ensure that the expression evaluates to a Boolean. For example, you can use functions like IS_NULL, IS_NOT_NULL, or logical operators to create conditions that yield true or false.
  
  
  Test the Expression: After making changes, test the expression in the BRF environment to ensure it behaves as expected and resolves the error.
  
  
  Related Information:
  
  BRF+ Documentation: Refer to the official SAP documentation for BRF+ to understand the expected data types and how to work with expressions and rules.
  Debugging Tools: Use the debugging tools available in the BRF+ environment to step through the logic and identify where the expression is failing.
  Community Forums: If you continue to face issues, consider reaching out to SAP community forums or support for additional insights and assistance.
  
  By following these steps, you should be able to identify and correct the issue causing the BRF446 error in your SAP BRF+ implementation.