Problem when buffering

All cursors are in form1 as buffermodeoverride = 4

I press a buttom and go to form2 where a grid is

There no cursor in form2

I modify data in form2 GRID and then go back to form1

In form1 I press a button save

When I close all forms and open forms again, GRID in form 2 is not changed

I open table with use and its not changed

Below is button.CLICK

SELECT ITENS
TABLEUPDATE ()
SELECT AP
TABLEUPDATE ()
SELECT cl
TABLEUPDATE ()
SELECT invetory
TABLEUPDATE()




Moises