[FIX] purchase: fix rev 7392e476b8f8721260d0eb10413c7a52a25ca469
[FIX] purchase: fix rev 7392e476b8f8721260d0eb10413c7a52a25ca469

Force the company currency before playing with the rates.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo