How To Fix FDT_EXPRESSIONS034 - Invalid boolean string; unexpected next token '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 034

• Message text: Invalid boolean string; unexpected next token '&1'

What causes this issue?

In the current boolean expression, the system has determined that at
least one occurrence of the token '&v1' is at an invalid position in the
condition string. For example, it is not permitted that two operands
follow each other with no operator inbetween, or that an opening bracket
"(" or the "NOT" operator follows directly after an operand.

System Response

The object cannot be activated.

How to fix this error?

Make sure that there is always an operator between two operands. Note
that brackets are part of an operator and cannot act as an operand.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS034 - Invalid boolean string; unexpected next token '&1' ?

  The SAP error message FDT_EXPRESSIONS034 indicates that there is an issue with a boolean expression in your SAP system, specifically that the expression contains an unexpected token. This error typically arises in the context of using the SAP Fiori Design Time (FDT) or when working with expressions in various SAP applications.
  
  Cause:
  The error message "Invalid boolean string; unexpected next token '&1'" suggests that the boolean expression you are trying to evaluate or use contains a syntax error. The token &1 in the message usually represents the specific part of the expression that is causing the issue. Common causes include:
  
  Syntax Errors: There may be a typo or incorrect syntax in the boolean expression.
  Invalid Characters: The expression may contain characters that are not allowed in boolean expressions.
  Logical Errors: The logical structure of the expression may be incorrect, such as missing operators or operands.
  Incorrect Data Types: The expression may be trying to evaluate incompatible