Avoid Nested COND or SWITCH Expressions

WarningClean ABAP & Modern Syntax#EC NO_NESTED_CONDRemote Enabled

Overview

Avoid Nested COND or SWITCH Expressions.

ATC Finding Message: Avoid nesting COND or SWITCH expressions inside each other

Rationale

Nesting COND or SWITCH constructor expressions inside each other creates deeply indented, hard-to-read expression trees. Modern Clean ABAP guidelines explicitly recommend avoiding nested constructor expressions; instead, separate complex decision branches into focused helper methods or classic CASE constructs.

Non-Compliant

lv_val = COND #( WHEN cond1 THEN COND #( WHEN cond2 THEN 'A' ELSE 'B' ) ELSE 'C' ).

Compliant

lv_val = COND #( WHEN cond1 AND cond2 THEN 'A'
                 WHEN cond1           THEN 'B'
                 ELSE                      'C' ).

Suppression

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

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

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

Related Rules

• Prefer COND #( ) Expression over IF/ELSEIF/ELSE — #EC PREF_COND
• Prefer SWITCH #( ) Expression over CASE Statement — #EC PREF_SWITCH
• Limit Control Flow Nesting Depth (Guard Clause Enforcement) — #EC MAX_NESTING

Technical Details

• Native ATC Class: ZCL_SKYLINT_NO_NESTED_COND
• Implementation File: zcl_skylint_no_nested_cond.clas.abap