I already did it I put a decimal_places = 4 and rounding = 0.0001 I still see the error.
in the invoice I have 82 lines.

no. first thing. price and etc. can be precision 10 what ever. it not affect to accounting. it will round till currency. so what is working(tested in real by me), maybe not best way, but working on odoo.
so price-as much as you need precision.
after that(multicurrency activation, no matter you use that or no, different purpose). after that go accounting/configuration/currency-set currency precision till what you need. and when you will have that result (but for e.g in stock value grouped view it will be still 2 points after dot).