Ship not confirmed with Automated Ship Confirm-SRS

I am using

fnd_request.submit_request ('WSH', --'APPLICATION SHORT NAME',   Full Name=> (Shipping Execution)

                                  'WSHASCSRS', --'CONCURRENT PROG SHORT NAME',  Full Name=>(Automated Ship --Confirm - SRS)

                                  NULL,

                                  SYSDATE,

                                  FALSE,

                                  21,           --Ship Confirm Rule:- (NC USA)

                                  TO_CHAR (SYSDATE, 'YYYY/MM/DD HH24:MI:SS'), --Actual Departure Date:-

                                  1,             --Ship Confirm Batch Prefix:-

                                  NULL,

                                  NULL,

                                  1072, --Organization:- (NC USA PERIODIC 1 - UD1)

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  NULL,

                                  CHR (0));

for automated ship confirm from back-end but delivery not ship confirmed while i am running "Automated Ship Confirm - SRS" from front-end it proceeds for ship confirm.