>Does someone know why the 2 following methods to calculate MyTotal don't give me the same value.
>
>I think I mist something with buffering but I'm not
>100% sure.

I tested your code last night. They are returning the same result. Also, the forms does not contain buffering, so buffering does not apply ehre. The REPLACE is an immediate change into the table. I also tested this code on various sample data for your project and they always returned the same value unless I don't have your latest version.