I got a syntax error because the comment with leading * is not aligned at the beginning of a line.
FORM form USING VALUE(pv_bool) TYPE abap_bool.
ENDFORM.
START-OF-SELECTION.
PERFORM form USING:
* comment
abap_true,
abap_false.
FORM form USING VALUE(pv_bool) TYPE abap_bool.
ENDFORM.
START-OF-SELECTION.
PERFORM form USING
* comment
abap_true.
PERFORM form USING abap_false.

Thanks in advance!
I got a syntax error because the comment with leading
*is not aligned at the beginning of a line.Thanks in advance!