Cash rounding only allowed for one account to be specified => Belgian accounting requires 2 types of account depending on whether the rounding line on the invoice is a + or - amount.
On cash rounding config (account.cash.rounding), one account is added (many2one). Existing account is renamed Profit account, new account is named Loss account.
The loss account is used when rounding line has a negative amount, and vice versa for profit account (account.move).
If no Loss account is set, only Profit account is used.
task : https://www.odoo.com/web?#id=2091658&action=327&model=project.task&view_type=form&menu_id=4720closesodoo/odoo#39488
Signed-off-by: Quentin De Paoli (qdp) <qdp@openerp.com>