Scheduling request set

Dear Team ,

I am trying to schedule a concurrent request from backend . For this I used this code. But I am not able to generate the request id for this. Could you please let me know what is missing here.

declare

 

req_id number := 0;

vResult boolean;

BEGIN

XXHCC_Auto_Mon_End_day2_pkg.apps_init('HCCAPA');

vResult := fnd_submit.set_request_set('PA','FNDRSSUB1014');

vResult := fnd_submit.submit_program('PA', 'PRC: Distribute Labor Costs for a Range of Projects', 'STAGE10', CHR(0));

vResult := fnd_submit.submit_program('PA', 'PRC: Distribute Usage and Miscellaneous Costs', 'STAGE15', CHR(0));

vResult := fnd_submit.submit_program('PA', 'PRC: Create and Distribute Burden Transactions for a Range of Projects', 'STAGE20', CHR(0));