Before, when importing twice the same invoice, or even with the more
theoretical possibility of having the same number for different partners,
the constraint would be triggered, giving unnecessary problems when
importing vendor bills with an uncertain partner_id.
If we check the logic followed in the regular accounting on the ref field,
it only triggers when a partner is set, so we can follow the same logic here.
closesodoo/odoo#68408
X-original-commit: 9cbf63bd644d6d6d629266fe31edc91b44f22aa6
Signed-off-by: William André (wan) <wan@odoo.com>
Signed-off-by: Josse Colpaert <jco@openerp.com>
Josse Colpaert
ca4a25d884