diff --git a/l10n_it_delivery_note/models/stock_picking.py b/l10n_it_delivery_note/models/stock_picking.py
index 580fe65908cd..f73f07b220ce 100644
--- a/l10n_it_delivery_note/models/stock_picking.py
+++ b/l10n_it_delivery_note/models/stock_picking.py
@@ -389,6 +389,7 @@ def _get_partners(self):
         partner_id = self.mapped("partner_id")
         src_location_id = self.mapped("location_id")
         dest_location_id = self.mapped("location_dest_id")
+        picking_type_code = self.mapped("picking_type_code")
 
         src_warehouse_id = src_location_id.get_warehouse()
         dest_warehouse_id = dest_location_id.get_warehouse()
@@ -397,16 +398,18 @@ def _get_partners(self):
         dest_partner_id = dest_warehouse_id.partner_id
 
         if not src_partner_id:
-            src_partner_id = partner_id
-
-            if not dest_partner_id:
-                raise ValueError(
-                    "Fields 'src_partner_id' and 'dest_partner_id' "
-                    "cannot be both unset."
-                )
+            src_partner_id = (
+                self.company_id.partner_id
+                if picking_type_code == ["outgoing"]
+                else partner_id
+            )
 
-        elif not dest_partner_id:
-            dest_partner_id = partner_id
+        if not dest_partner_id:
+            dest_partner_id = (
+                self.company_id.partner_id
+                if picking_type_code == ["incoming"]
+                else partner_id
+            )
 
         return (src_partner_id, dest_partner_id)