Oracle Forms

Form 6i

I want to disable or enable Menu Item as per user Requirements.
I created a table and put some rows in it.

now I am using this code in when-new-form-instance

Declare
 		menuitem_name varchar2(100) ;
 		mi_id MenuItem;
 		mi varchar2(100);
 		fnm varchar2(20);
	Cursor c2 is
	select userid,username,status,form_name from user_forms where username = :g_user;
	--r1 c2%rowtype;
	vuid		user_forms.userid%type;
	vunm		user_forms.username%type;
	vstat		user_forms.status%type;
	vfnm		user_forms.form_name%type;
 	begin
 			menuitem_name := 'SETUP_MENU.';
open c2;
loop
fetch c2 into vuid,vunm,vstat,vfnm;
exit when c2%notFOund;
	MI := Menuitem_name||vfnm;
		

	--	SYNCHRONIZE;PAUSE;
	mi_id := Find_Menu_Item(mi);
	IF Get_Menu_Item_Property(mi_id,ENABLED) = 'TRUE' THEN
	set_menu_item_property('SETUP_MENU'||vfnm,enabled,property_false);
		end if;
end loop;
end;

after run this form showing me message SETUP_MENU.CITY and also shows Cannot Find Menu Item Invalid ID
when It find SETUP_MENU.CITY why showing message Cannot Find Menu Item Invalid ID.?

and the other hand when I use another code

declare
menuitem_name varchar2(100) := 'SETUP_MENU.CITY';
mi_id MenuItem;
BEGIN
mi_id := Find_Menu_Item(menuitem_name);
 
IF Get_Menu_Item_Property(mi_id,ENABLED) = 'TRUE' THEN

Set_Menu_Item_Property(mi_id,ENABLED,PROPERTY_FALSE);
END IF;
END;

it is working accordingly,
difference is that in my first code I am calling data from table and I also display on screen
message (MI); -- It returns SETUP_MENU.CITY as I use in 2nd code
please guide me why first code is not run accordingly.