Hello Tore

I must change the controlsource because it´s the unique way to show me the calculate value on my grid.
The problem that when i change the controlsource the value appear on the grid but if i make a browse to my table the field is empty because the controlsource is not the field of my table, that´s why i can´t change the controlsource but i need to change the value only to write them on my table field.
with my code instead of changing controlsource could i change ".Value" of my field.
Could you based on my code ,make some changes to do that ??, or have you another suggestion.

Many thanks
Luis Santos