[FIX] purchase: recover vendor bill auto-complete by vendor reference

Up to v11 it was possible to search by purchase vendor reference when
we're using the auto-complete function in a vendor bill. With the
refactor of this functionality, this useful feature was lost.

opw:3387397

closes odoo/odoo#132896

X-original-commit: 0e7257306bb3dc8258b9642a53e2eefe7493c487
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

addons/purchase/report/purchase_bill.py

@@ -9,6 +9,7 @@ class PurchaseBillUnion(models.Model):
     _auto = False
     _description = 'Purchases & Bills Union'
     _order = "date desc, name desc"
+    _rec_names_search = ['name', 'reference']
 
     name = fields.Char(string='Reference', readonly=True)
     reference = fields.Char(string='Source', readonly=True)