Post-processing not completed

We have a customization where we submit a concurrent request using fnd_request.submit_request. If the submission returns a request ID, a post-processing action is assigned as follows: 

IF v_requestid1 IS NOT NULL THEN

      COMMIT;
      v_num :=fnd_conc_pp.assign(
                                application     =>'XXC',
                                executable_name =>'XXCPOSTPROC',
                                req_id        =>v_requestid1 ,
                                s_flag        =>'Y',
                                w_flag        =>'Y',
                                f_flag        =>'N',
                                Arg1        =>'ADD_ATTACH_PO',
                                Arg2        =>v_po_header_id,
                                Arg3        =>'application/pdf',
                                Arg4        =>v_revision_num,
                                Arg5        =>'To Supplier',
                                Arg6        =>v_release_num,
                                Arg7        =>NULL,
                                Arg8        =>NULL,
                                Arg9        =>NULL,
                                Arg10       =>NULL
                                );

   END IF;
   COMMIT;

The action was executed for the first test and I see the following message in the log: