Not able to create Billing schedules

 Hi All,                 I am using the below code to create billing schedules in service Contracts but the billing schedules are not getting created.I am really struck at this from 2 days.Hoping for some help in this community to drive me forward.

   Thanks & Regards
          Krishna

CREATE OR REPLACE PROCEDURE KBB_BILLING_SCHEDULE AS

        l_strm_level_tbl              OKS_BILL_SCH.STREAMLVL_TBL;

        v_bill_qtrs                              NUMBER := 0;

        v_bill_mths                              NUMBER := 0;

        v_bill_days                               NUMBER := 0;

        v_net_amount                          NUMBER := 468;

        v_acct_rule_name                     VARCHAR2(50) := 'KBB - QUARTERLY';

        v_amt_per_day                        NUMBER;

        x_error_locator                        VARCHAR2(2000);

        v_start_date                             DATE := '04-MAY-2010'