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