CHECK_99 - Minimum number of WHENs in a CASE

A CASE statement should have a minimum number of WHEN branches. If there is only one branch, it would be better to use an IF statement.

FORM foo.
  DATA lv_bar TYPE i.
  CASE lv_bar.
    WHEN 1.
      WRITE: / 'hello world'.
  ENDCASE.
ENDFORM.

can be replaced by

FORM foo.
  DATA lv_bar TYPE i.
  IF lv_bar = 1.
    WRITE: / 'hello world'.
  ENDIF.
ENDFORM.

Empty WHEN branches don’t count.

When setting the minimum number, please consider the recommendations in SAP’s styleguide for Clean ABAP: Prefer CASE to ELSE IF for multiple alternative conditions

Configuration

The minium number of WHEN branches is by default 2, but can be configured: