How To Fix BRF357 - Expression "&1" in random expression &2 is not a valid expression

BRF357 - Overview

• Message type: E = Error

• Message class: BRF - Messages for Business Rule Framework

• Message number: 357

• Message text: Expression "&1" in random expression &2 is not a valid expression

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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.

Unfortunately, there isn't any extra information in this error notice.

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BRF357 - Details

• The SAP error message BRF357 indicates that there is an issue with a Business Rule Framework (BRF) expression in your SAP system. Specifically, the error states that the expression referenced by "&1" in the context of another expression "&2" is not valid. This can occur for several reasons, and understanding the cause and solution can help you resolve the issue.
  Causes:
  
  Syntax Errors: The expression may contain syntax errors or invalid characters that prevent it from being recognized as a valid expression.
  Missing Components: The expression might reference components (like functions, constants, or other expressions) that do not exist or have been deleted.
  Incorrect Data Types: The expression may be using data types that are incompatible with the expected input or output types.
  Logical Errors: There may be logical errors in the expression that make it invalid in the context of the parent expression.
  Versioning Issues: If the expression was modified or updated, it may not