How To Fix SY421 - Specified comparison operator is not permitted


SY421 - Overview

  • Message type: E = Error

  • Message class: SY - ABAP/4 system messages

  • Message number: 421

  • Message text: Specified comparison operator is not permitted

  • Show details Hide details
  • What causes this issue?

    You may only use one of the following comparison operators with
    conditional watchpoints:

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

    >, >=, =, <>, <, >=
    The operator that you used here is not allowed.

    System Response

    How to fix this error?

    Use one of the above comparison operators instead.
    If you do not use a comparison operator, the debugger will stop
    whenever the value changes.

    Error message extract from SAP system. Copyright SAP SE.


Smart SAP Assistant

  • What is the cause and solution for SAP error message SY421 - Specified comparison operator is not permitted ?
    The SAP error message SY421 ("Specified comparison operator is not permitted") typically occurs in ABAP programming when there is an issue with the use of comparison operators in a conditional statement. This error indicates that the operator used in the comparison is not valid or not allowed in the context where it is being used.
    Causes:
    
    Invalid Operator: The comparison operator used (e.g., =, <>, <, >, <=, >=) is not valid for the data types being compared.
    Data Type Mismatch: The operands being compared may not be compatible data types. For example, comparing a string with a numeric value.
    Syntax Error: There may be a syntax error in the conditional statement that leads to the use of an invalid operator.
    Logical Errors: Using operators in a way that does not make sense logically, such as trying to compare a table with a single value.
    
    Solutions:
    
    Check Operators: Ensure that the comparison operators used are valid for

    Already have an account? Login here!




Instant HelpGet instant SAP help. Sign up for our Free Essentials Plan.


Related SAP Error Messages

Click the links below to see the following related messages:

Click on this link to search all SAP messages.


Rating
The AI Support Assistant is great. It provides comprehensive assistance even on the most difficult issues. I highly recommend this service.
Rate 1
John Jordan
SAP Consultant & Author