How To Fix WD425 - Relational operator '&' not defined

SAP Error Message - Details

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 425

• Message text: Relational operator '&' not defined

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Smart SAP Assistant

• What is the cause and solution for SAP error message WD425 - Relational operator '&' not defined ?

  Certainly! Here's a detailed explanation for the SAP error message WD425: Relational operator '&' not defined:
  
  Error Message
  WD425: Relational operator '&' not defined
  
  Cause
  This error occurs in the context of Web Dynpro ABAP when a relational operator used in an expression or condition is not recognized or supported by the Web Dynpro expression parser.
  Specifically, the operator '&' is not a valid relational operator in Web Dynpro expressions. The ampersand (&) is often mistakenly used by developers who might confuse it with logical operators or string concatenation operators from other contexts.
  
  In ABAP, & is not a relational operator.
  In Web Dynpro expressions, only certain relational operators are allowed, such as:
  
  =, <>, <, >, <=, >=
  
  
  Logical operators like AND, OR, NOT are used for combining conditions.
  The & operator is not defined as a relational or logical operator in Web Dynpro expressions.
  
  
  When does it happen?
  
  When you write an expression in Web Dynpro (e.g., in a context mapping, property binding, or condition) and use & as a relational or logical operator.
  For example, an expression like:  
  context/Value & 'someValue'
  or  
  context/Value & context/OtherValue
  will cause this error.
  
  
  
  Solution
  
  
  Replace the & operator with the correct operator depending on your intent:
  
  
  If you want to concatenate strings:
  
  Use the CONCATENATE function or the & operator in ABAP code, but not in Web Dynpro expressions.
  In Web Dynpro expressions, string concatenation is not supported directly. You need to do concatenation in the ABAP code or use a context attribute that already contains the concatenated string.
  
  
  
  If you want to perform a logical AND:
  
  Use the keyword AND instead of &.
  Example:  
  context/Value = 'X' AND context/OtherValue = 'Y'
  
  
  
  
  If you want to compare values:
  
  Use the appropriate relational operator like =, <>, <, >, <=, >=.
  
  
  
  
  
  Check your expression syntax carefully and ensure you use only supported operators.
  
  
  
  Additional Information
  
  The error is specific to Web Dynpro ABAP expression language, which is more restrictive than full ABAP syntax.
  The expression parser in Web Dynpro does not support all ABAP operators.
  For complex logic or string operations, consider implementing the logic in the ABAP backend or in the component controller and expose the result to the Web Dynpro context.
  Always refer to the official SAP documentation for Web Dynpro expression syntax and supported operators.
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WD425: Relational operator '&' not defined
  
  
  Cause
  Use of invalid operator & in Web Dynpro expression
  
  
  Correct Operators
  =, <>, <, >, <=, >=, AND, OR, NOT
  
  
  Solution
  Replace & with AND for logical AND, or use proper concatenation in ABAP code
  
  
  Context
  Web Dynpro ABAP expression language
  
  
  
  
  If you provide the exact expression or code snippet causing the error, I can help you correct it specifically.