Function Module CNECP_MAINTAIN

Hello experts.

I am using this function module. After a lot of tests i have been able (more or less) to make it work. I have one question, at the beguining of the function module it has this control:

CALL FUNCTION 'PSSFAW_CHECK_SWITCH_ACTIVE_EXT'

EXPORTING

i_switch_name = 'PS_EXTN_SFWS_UI_1'

IMPORTING

e_active = variable1

EXCEPTIONS

method_not_found = 1

OTHERS = 2.

After executing this function it returns the value of variable1 equal to space, and it should come equal to X. By debugging i have change this value and the function works but i need to know why this variable1 comes in blanck and what should i do to fix it.

IF variable1 <> 'X' .

MESSAGE a001(prgr_ntw_wbs) INTO lv_message_text .

CALL FUNCTION 'ECP_ADD_MESSAGES'

EXPORTING

message = lv_message_text

TABLES

messages = messages.

RETURN.

ENDIF.

Thanks.

Alex