Problem in getting dynamic LOV

Question

hi i am trying to acheive dynamic LOV.
i followed the steps
1.created a static record group
2.created a LOV and assigned with the above created static record group.
3.in w-n-b-i trying to create the DRG
DECLARE
   rg_id    RECORDGROUP;
   grp_col  GROUPCOLUMN;
   rg_name  VARCHAR2(25) := 'RG_NAME';
   col_name VARCHAR2(25) := 'TYPE';
   lov_id   LOV;
BEGIN
   /* Check if the RG already exists */
   rg_id := Find_Group(rg_name);
   IF ( NOT Id_Null(rg_id) ) THEN
      Delete_Group(rg_id);
   END IF;
   /* Create instance of DRG */
   rg_id := Create_Group(rg_name);
   grp_col := Add_Group_Column(rg_id, col_name, CHAR_COLUMN, 8);
   /* Assign the DRG to the LOV */
lov_id := Find_Lov('TYPE_LOV');
   Set_Lov_Property(lov_id, GROUP_NAME, rg_name);
END;4.in w-v-i of type
DECLARE
   rg_id   RECORDGROUP;
   grp_col   GROUPCOLUMN;
   tmp_gc  GROUPCOLUMN;
   rg_name   VARCHAR2(25) := 'RG_TYPE';
   col_name   VARCHAR2(25) := rg_name||'.'||'TYPE';
   n_dummy1  NUMBER;
   n_dummy2  NUMBER;
   curr_rec   INTEGER;
   err_code  NUMBER;
BEGIN
   curr_rec := Get_Block_Property(Name_In('SYSTEM.TRIGGER_BLOCK'), CURRENT_RECORD);
   rg_id := Find_Group(rg_name);
   grp_col := Find_Column(col_name);
   /* Add the value to the DRG */
   -- Add row first./*
   Add_Group_Row(rg_id, END_OF_GROUP);
   -- Now add the value.
   Set_Group_Number_Cell(grp_col, curr_rec, To_Number(:BMM_DESC));
   /* Verify the value was added */
   n_dummy1 := Get_Group_Row_Count(rg_name);
   tmp_gc := Find_Column(col_name);
   FOR j IN 1..n_dummy1 LOOP
      n_dummy2 := Get_Group_Number_Cell(tmp_gc, j);
      IF ( nvl(n_dummy2, 9999999999) = 9999999999 ) THEN
         Clear_Message;
         Message('Add Failed');
         Message('Add Failed');
      ELSE
         err_code := Populate_Group(rg_id);
         Clear_Message;
         Message('Add Successful');
      END IF;
   END LOOP;
      MESSAGE('FIRING');MESSAGE('FIRING');
END;the problem is the lov is not appearing at all(previously the lov was appearing along with the static value assigned)
when i tried to add value to the item(type), i am getting the following error:
FRM-40735 WHEN-VALIDATE-ITEM trigger raised unhandled exception ora-06502
i am getting pop up message-error in adding group row
i have not done this before. in the help of some contents which is present in the fourm, i have tried it.
where i am missing?
Please help

Answer 1

there seems to be problem with the item type, varchar2 or numeric whatever. check that.