I have a formula wich have work for some time and then stop working. Only thing I change is to add some field but nothing linked to the formula. I think that it seem to be a field type issue. Here the formula:

sum(total_vente, prix_shipping, taxes);

these field are $ field. I tryed to add ''number()'' before each field but nothing works...I also tryed to just write total_vente but nothing shown...

Any ideas? Thanks!