I just try to make invoice print work for Poland.
What I found is strange tax calculation. Taxes are not rounded on line basis.
If there are three lines with tax calculated to 12.336 EUR tax will be 12.336x3=37EUR not 12.34 (rounding on line) x3 = 37.02 EUR
Is it ok in your country ? You must validate it before using Odoo.
Marek Mosiewicz
http://consultantodoo.com