Declare Optional and Default Parameters Last in Methods

WarningClean ABAP & Modern Syntax#EC PREF_OPTIONAL_LASTRemote Enabled

Overview

Declare optional and default parameters last in methods.

ATC Finding Message: Declare mandatory parameters before OPTIONAL and DEFAULT parameters

Rationale

In Clean ABAP, mandatory parameters must appear before optional (OPTIONAL) and default (DEFAULT) parameters in method signatures. Mixing optional and required parameters makes caller invocation confusing and error-prone.

Standard: Place required parameters first, followed by optional parameters at the end of the parameter list.

Non-Compliant

METHODS process_data
  IMPORTING
    iv_opt TYPE i OPTIONAL
    iv_req TYPE i.

Compliant

METHODS process_data
  IMPORTING
    iv_req TYPE i
    iv_opt TYPE i OPTIONAL.

Suppression

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

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

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

Related Rules

• Method Call Parameter Naming Style (Omit or Require) — #EC PREF_PARAM_NAME
• Single Parameter or Field Per Line — #EC PREF_PARAM_1LINE
• Limit Method Parameter Count and Require Multi-Line Signatures — #EC MAX_PARAMS_COUNT

Technical Details

• Native ATC Class: ZCL_SKYLINT_PREF_OPT_LAST
• Implementation File: zcl_skylint_pref_opt_last.clas.abap