diff --git a/modules/purchase_trade/purchase.py b/modules/purchase_trade/purchase.py
index 42ff5c3..ab67d6a 100755
--- a/modules/purchase_trade/purchase.py
+++ b/modules/purchase_trade/purchase.py
@@ -993,7 +993,7 @@ class Purchase(metaclass=PoolMeta):
         return link
 
     @staticmethod
-    def _summary_mixed_link(records):
+    def _summary_mixed_link(records, default_model=None):
         unique = []
         seen = set()
         for model, record in records:
@@ -1008,6 +1008,8 @@ class Purchase(metaclass=PoolMeta):
         link = {
             "count": len(unique),
         }
+        if default_model:
+            link["model"] = default_model
         if len(unique) == 1:
             model, record = unique[0]
             link.update({
@@ -1174,7 +1176,8 @@ class Purchase(metaclass=PoolMeta):
                 'lots': lots_count,
                 'route': route,
                 'sales': self._summary_link('sale.sale', sales),
-                'shipments': self._summary_mixed_link(shipments),
+                'shipments': self._summary_mixed_link(
+                    shipments, default_model='stock.shipment.out'),
                 'invoices': self._summary_link('account.invoice', invoices),
             })
             totals['quantity'] += quantity