Sap script selecting only one printer.

hi ,
I am facing 1 issue, need your suggestions.
from the Z program i am calling .. one Sapscript. using FM:OPEN_FORM
Then sp01 one spool is generating. before generating SPOOL , it is asking which printer like below.
Just for testing, selected 3 printer names for 3 times. But spool is showing one printer name

CALL FUNCTION 'OPEN_FORM'
EXPORTING form = irldrc-formu
device = 'PRINTER'
language = sy-langu
options = itcpo
dialog = ' '
IMPORTING result = itcpp.

but If i see the SP01, Why it is selecting only Print Destination Nirvana Created
Like below it is showing. Any idea why it is showing like below every time.

Spool attributes.