Comment 17 for bug 707923

some more thougths
we should distinguish between
* supplier invoices
Austrian law requires that the tax shown on the invoice matches the one which is posted.
hence it is necessary to adapt the calculated values
the total is required by OpenERP , the vat must match - requreid by law, so we have to adapt very often the net (sub_total) which is calcuated qty*price and this is not possible - so the user has to add an extra line with cent difference - not very elegant

* customer invoices
the problem araises typically if invoices are created in another module (as for one of our clients ) or in another system for multiple lines with the same tax rate.
It becomes very visible for "easy to compute" tax rates like 10% reduced VAT in Austria for food and certain services (rent,...)

there is no way to ask the client to recalculate the rax manually - without beeing thrown out immediately.

the poll:
nice idea, but IMHO OpenERP should rely more on experts, because especially in a "market to be developed" the poll might not reach a significant number, but turn away interested prospects and potential partners, just my 2c on this.