Classic EXCEPTIONS must not map two errors to the same number

WarningAnti-Patterns & Bad Practices#EC EXC_OVERLAPRemote Enabled

Overview

Classic EXCEPTIONS must not overlap.

ATC Finding Message: Two classic exceptions share the same error number

Rationale

When two classic exceptions map to the same sy-subrc number, the caller cannot tell which failure occurred. This makes error handling guesswork and can hide the real cause. Assign distinct numbers and reserve OTHERS for unexpected failures.

Non-Compliant

CALL FUNCTION 'Z_PROCESS_ORDER'
  EXCEPTIONS
    system_failure        = 1 MESSAGE lv_message
    communication_failure = 1 MESSAGE lv_message
    OTHERS                = 1.

Compliant

CALL FUNCTION 'Z_PROCESS_ORDER'
  EXCEPTIONS
    system_failure        = 1 MESSAGE lv_message
    communication_failure = 2 MESSAGE lv_message
    OTHERS                = 3.

Suppression

To suppress findings for this rule, append the pseudo-comment to the statement:

" Standard pseudo-comment:
... "#EC EXC_OVERLAP

" SAP CI_ prefix format:
... "#EC CI_EXC_OVERLAP

Technical Details

• Native ATC Class: ZCL_SKYLINT_NO_EXC_OVERLAP
• Implementation File: zcl_skylint_no_exc_overlap.clas.abap