How To Fix WER400 - ***** 400 - 419: Expression comparison ********************************

SAP Error Message - Details

• Message type: E = Error

• Message class: WER - Messages for the package WER

• Message number: 400

• Message text: ***** 400 - 419: Expression comparison ********************************

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message WER400 - ***** 400 - 419: Expression comparison ******************************** ?

  The SAP error message **WER400 *** 400 - 419: Expression comparison typically relates to issues encountered during expression evaluation or comparison in SAP workflows, ABAP programs, or configuration where expressions or conditions are used.
  
  Cause
  
  Syntax or semantic errors in expressions: The error often occurs when an expression used in a workflow condition, rule, or ABAP code is malformed or contains invalid syntax.
  Data type mismatches: Comparing incompatible data types (e.g., comparing a string to a number) can trigger this error.
  Missing or incorrect variables: The expression references variables or fields that are not declared, initialized, or available in the current context.
  Unsupported operators or functions: Using operators or functions not supported in the expression language or context.
  Runtime evaluation errors: Division by zero, null values, or other runtime exceptions during expression evaluation.
  
  
  Solution
  
  
  Check the expression syntax:
  
  Review the expression carefully for syntax errors.
  Ensure all operators and functions are used correctly.
  Use SAP tools or transaction codes (e.g., SWI1 for workflows) to validate expressions.
  
  
  
  Verify data types:
  
  Confirm that the operands in the comparison are of compatible data types.
  Cast or convert data types explicitly if necessary.
  
  
  
  Ensure variables are correctly defined and initialized:
  
  Check that all variables or fields used in the expression exist and have valid values.
  Initialize variables before use.
  
  
  
  Use debugging tools:
  
  Use the ABAP debugger or workflow log to trace the evaluation of the expression.
  Identify the exact point of failure.
  
  
  
  Consult SAP Notes and documentation:
  
  Search for SAP Notes related to WER400 or expression comparison errors.
  Sometimes patches or updates fix known issues.
  
  
  
  Simplify the expression:
  
  Break complex expressions into simpler parts to isolate the problem.
  Test each part separately.
  
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  SWI1 - Workflow log: Check workflow errors related to expression evaluation.
  SE38 or SE80 - ABAP Editor: Review and debug ABAP code.
  ST22 - Dump analysis: Check for runtime errors related to expression evaluation.
  
  
  
  SAP Notes:
  
  Search the SAP Support Portal for notes referencing WER400 or expression comparison errors.
  
  
  
  Documentation:
  
  SAP Help Portal sections on Workflow conditions and expressions.
  ABAP documentation on expression syntax and data types.
  
  
  
  
  If you provide the exact context (e.g., workflow, ABAP program, configuration step) and the expression causing the error, I can help with a more precise diagnosis and solution.