diff --git a/l10n_it_delivery_note/wizard/delivery_note_select.py b/l10n_it_delivery_note/wizard/delivery_note_select.py
index f026d9f27746..219805b61c79 100644
--- a/l10n_it_delivery_note/wizard/delivery_note_select.py
+++ b/l10n_it_delivery_note/wizard/delivery_note_select.py
@@ -35,6 +35,10 @@ def _compute_fields(self):
 
         if self.selected_picking_ids:
             self.picking_ids += self.selected_picking_ids
+            if self.selected_picking_ids.mapped("sale_id.partner_id"):
+                self.partner_id = self.selected_picking_ids.mapped(
+                    "sale_id.partner_id"
+                ).id
         else:
             self.picking_ids = self.picking_ids