low prices and decimals

My shop is not calcualtring all the decimals. Whan setting up the product I can give a price with many decimals but when the customer is placing a purchase it rounds up the price to too much.
It would help if I put 3 decimals in the currency settings but it looks too stupid having that much.
Check wha I mean
http://garudakauppa.fi/nettikauppa/index.php?main_page=product_info&cPath=22_25&products_id=164
The price is set to be 0,069€ per cm
But zen cart automaticly calculates it to be 0,07€/cm
It would be ok, if it sowed 0,07 but then when buying 10cm the price in the shopping cart should be 0,69€

Can someone help me with this, thank you!

As I understand it, in Admin - Localization - Currency, the 'value' (last configuration setting) of your default currency (euro, in your case) needs to be 1.00000000, and then the decimal set to 2. Is That what you have now?

Yes that is what I have now. If the decimals would be set to 3 then it would work but that looks a bit stupid (for eg price 6,900€)