LOV with FRM-41042: No such property for SET_ITEM_PROPERTY

Question

Hi all,
I have a field (not a database item of the block ) of LOV object and a button next to it to trigger to the LOV list item.
However, whenever, i click on the button, FRM-41042: No such property for SET_ITEM_PROPERTY will be prompted. Though the list item do appear and the item can be set into the field.
Here is the procedure called by the when-button-pressed trigger of the button.
PROCEDURE press_lov_btn IS
v_lov_name           varchar2(30);
     v_sel                              boolean;
     l_target_item      varchar2(100);
BEGIN
l_target_item := NAME_IN ( 'SYSTEM.TRIGGER_BLOCK' ) || '.' ||
GET_ITEM_PROPERTY ( NAME_IN ( 'SYSTEM.TRIGGER_ITEM' ), PREVIOUSITEM );
IF l_target_item != NAME_IN ( 'SYSTEM.CURSOR_ITEM' ) THEN
GO_ITEM ( l_target_item );
     v_lov_name := get_item_property ( l_target_item, lov_name );
END IF;
     v_sel := show_lov ( v_lov_name );
if not v_sel then
     raise form_trigger_failure;
end if;
END press_lov_btn;
Any one know the error is due to the setting in the field or that in the button?????
Thanks a lot.

Answer 1

Your code to call a lov is a little complicated and errornous (as it depends on the item-ordering). The following code it a little easier (in my eyes). It depends just on naming-conventions, the button-name has to be 'BT_XXX' where XXX is the name of the item the lov is attached to.
PROCEDURE PR_LOV IS
  vcItem VARCHAR2(61):=REPLACE(NAME_IN ('SYSTEM.TRIGGER_ITEM'), '.BT_', '.');
  itItem  ITEM;
BEGIN
  itItem:=FIND_ITEM(vcItem);
  IF NOT ID_Null(itItem) THEN
    -- Navigate to the item
    GO_ITEM(vcItem);
    -- Show its lov
    DO_KEY('LIST_VALUES');
  ELSE
    message('invalid item ' || vcItem);
    RAISE FORM_TRIGGER_FAILURE;
  END IF;
END;Hope this helps.