How do I change the Currency Rate decimal precision? I need at least 9 decimals so the exchange rate calculation works.

Question

Hello, I'm new to Odoo 10, we have being using Odoo 8 for a couple of years now. I'm trying to evaluate Odoo 10 to see if it is worthy to pay the update.
I installed the 10 version (community edition), but I cannot find how to change the currency rate decimal presicion, for Odoo 8 there was an App that you install and it would appear in "Settings -> Database Structures -> decimal presicion", but there is no app or module for 10th version.
We are from Costa Rica, and 1 USD = 555 CRC, and we need

axatech01@gmail.com · Accepted Answer

To work around,
change digits from (12,6) to (12,10).
Find file  vim /usr/lib/python2.7/site-packages/openerp/addons/base/res/res_currency.py  and search for next strings:
1- First Change:
_columns = {
'rate': fields.function(_get_current_rate, string='Current Rate', digits=(12,10),

2- Second Change:

class res_currency_rate(osv.osv):
_name = "res.currency.rate"
_description = "Currency Rate"
_columns = {        'rate': fields.float('Rate', digits=(12, 10), help='The rate of the currency to the

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