How To Fix BRF154 - Variable stack with processing of expression &1 is empty

BRF154 - Overview

• Message type: E = Error

• Message class: BRF - Messages for Business Rule Framework

• Message number: 154

• Message text: Variable stack with processing of expression &1 is empty

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message BRF154 - Variable stack with processing of expression &1 is empty ?

  The SAP error message BRF154, which states "Variable stack with processing of expression &1 is empty," typically occurs in the context of Business Rule Framework (BRF+) when there is an issue with the evaluation of a rule or expression. This error indicates that the variable stack, which is used to hold the values of variables during the execution of a rule, is empty when it is expected to contain values.
  Causes:
  
  Missing Input Variables: The most common cause is that the input variables required for the expression are not being passed correctly or are missing entirely.
  Incorrect Rule Configuration: The rule or expression may be incorrectly configured, leading to a situation where it cannot retrieve or compute the necessary values.
  Data Type Mismatch: There may be a mismatch in the expected data types of the variables being processed, leading to an inability to evaluate the expression.
  Execution Context Issues: The context in which the rule