problem displaying prices on order and invoice

[joelferry]

hello,
I've a problem with displaying prices on orders and invoices because I'm using a rule with manufacturer discount to calculate the base price
so on orders ans invoices, the prices displayed are my purchase prices and the discount is negative ...
somebody could help me,
must I don't use manufacturer discount prices calculating ?
from a french user who never receive any answer from french Virtuemart forum
best regards