Hello,

on a product when we change the "Tax Class" the "Product price gross" is automatically re-calculated based on "Product price net" + new "Tax Class" ...
I would like to modify this feature so that when I change a tax, the "Product price gross" stay the same and the "Product price net" change ... there have been a recent up in the French taxes but I want to keep the same selling prices for my customers.
problem is that I still didn't found in which php file all this is located ...

thanks for your help