pop up is not appearing in user decion of workflow

hi

i have to use a popup to get user input after approve option of workflow decion.

however , i have made a BOR with this code.

BEGIN_METHOD POPUP CHANGING CONTAINER.
data : text type CATSXT_LONGTEXT_ITAB ,
title type SYTITLE ,
l_text(72) .
data : v_text(1000) .
title = 'Reason for Rejection' .
CALL FUNCTION 'CATSXT_SIMPLE_TEXT_EDITOR'
EXPORTING
IM_TITLE = title
IM_START_COLUMN = 20
IM_START_ROW = 20
CHANGING
CH_TEXT = text .
SWC_SET_TABLE CONTAINER 'reason_text' text.
END_METHOD.

moreover , when i use required or optional method standard dialog has appeared but i need to show different text instaed " REASON FOR APPROVE"

REGARDS