Master-detail form create new record error. part2

Hello FS Team,

after we solved the issue described here http://osqa.theformspider.com/questions/1740/master-detail-form-create-new-record-error

we faced another one: when we try to create new record we get "Datasource "ds_name" has no current row." error. we try to create new row using the "createPers" procedure. First we create the row of the master table. After that we are trying to create the corresponding rows of the detail tables. Here is the procedure code (I will send the entire package code with app xml export to email as well):

  procedure createPers is
v_row_id  number;
v_pers_id number;
v_rtip_id number;
v_rnap_id number;
v_intr_id number;
v_dprt_id number;
v_tick_id number;
begin
    v_row_id:=api_datasource.createRow('SB_PERS1',api_datasource.getCurrentRowID('SB_PERS1'));
    select pers_seq.nextval into v_pers_id from dual;
    api_datasource.setColumnValue('SB_PERS1.PERS_ID', v_pers_id, v_row_id);
    if api_session.getValueTX('FORM') = 'ZADERJPASS' then
        api_datasource.setColumnValue('SB_PERS1.PERS_CLASS', 1, v_row_id);
        v_row_id:=api_datasource.createRow('SB_RTIP1');
        select rtip_seq.nextval into v_rtip_id from dual;
      v_rnap_id := null;
      api_datasource.setColumnValue('SB_RTIP1.RTIP_ID',      v_rtip_id, v_row_id);
      api_datasource.setColumnValue('SB_RTIP1.RTIP_PERS_ID', v_pers_id, v_row_id);
    else   -- DEPORTPASS
      api_datasource.setColumnValue('SB_PERS1.PERS_CLASS', 0, v_row_id);
      v_row_id:=api_datasource.createRow('SB_RNAP1');
      select rnap_seq.nextval into v_rnap_id from dual;
      v_rtip_id := null;
      api_datasource.setColumnValue('SB_RNAP1.RNAP_ID',      v_rnap_id, v_row_id);
      api_datasource.setColumnValue('SB_RNAP1.RNAP_PERS_ID', v_pers_id, v_row_id);
    end if;
    v_row_id:=api_datasource.createRow('SB_INTR1');
    select intr_seq.nextval into v_intr_id from dual;
    api_datasource.setColumnValue('SB_INTR1.INTR_ID',      v_intr_id, v_row_id);
    api_datasource.setColumnValue('SB_INTR1.INTR_PERS_ID', v_pers_id, v_row_id);
    api_datasource.setColumnValue('SB_INTR1.INTR_RTIP_ID', v_rtip_id, v_row_id);
    api_datasource.setColumnValue('SB_INTR1.INTR_RNAP_ID', v_rnap_id, v_row_id);
    v_row_id:=api_datasource.createRow('SB_DPRT1');
    select dprt_seq.nextval into v_dprt_id from dual;
    api_datasource.setColumnValue('SB_DPRT1.DPRT_ID',      v_dprt_id, v_row_id);
    api_datasource.setColumnValue('SB_DPRT1.DPRT_PERS_ID', v_pers_id, v_row_id);
    api_datasource.setColumnValue('SB_DPRT1.DPRT_RTIP_ID', v_rtip_id, v_row_id);
    api_datasource.setColumnValue('SB_DPRT1.DPRT_RNAP_ID', v_rnap_id, v_row_id);
    v_row_id:=api_datasource.createRow('SB_TICK1');
    select tick_seq.nextval into v_tick_id from dual;
    api_datasource.setColumnValue('SB_TICK1.TICK_ID',      v_tick_id, v_row_id);
    api_datasource.setColumnValue('SB_TICK1.TICK_PERS_ID', v_pers_id, v_row_id);
    api_datasource.setColumnValue('SB_TICK1.TICK_SER_NUM', '12345', v_row_id);
    v_row_id:=api_datasource.createRow('SB_SERV1');
    api_datasource.setColumnValue('SB_SERV1.SERV_PERS_ID', v_pers_id, v_row_id);
    api_datasource.previousRow('SB_PERS1');
          end;

Could you please specify what is incorrect in this code which causes "Datasource "ds_name" has no current row." error?

Many thanks in advance,

Anatoly