[fix] rewrite date invoice only if not already set

models/scop_bordereau_cg.py

@@ -366,8 +366,11 @@ class Bordereau(models.Model):
         self.ensure_one()
         for inv in self.invoice_ids:
             if inv.state == 'draft':
+                if not inv.date_invoice:
                     inv.update({
                         'date_invoice': self.date_cotisation,
+                    })
+                inv.update({
                     'payment_mode_id': self.payment_mode_id,
                 })
                 if self.is_sdd and not inv.mandate_id: