diff --git a/modules/purchase_trade/purchase.py b/modules/purchase_trade/purchase.py
index ab15052..078d404 100755
--- a/modules/purchase_trade/purchase.py
+++ b/modules/purchase_trade/purchase.py
@@ -1480,9 +1480,15 @@ class Line(metaclass=PoolMeta):
     def on_change_linked_unit(self):
         self._recompute_trade_price_fields()
 
-    @classmethod
-    def write(cls, *args):
-        # Agents:
+    @classmethod
+    def write(cls, *args):
+        actions = iter(args)
+        args = []
+        for records, values in zip(actions, actions):
+            cls._check_delivery_period_values(records, values)
+            args.extend((records, values))
+
+        # Agents:
         # Ici on gère la variation éventuelle de la théorical quantity après création du contrat
         # Si delta > 0 on met à jour le lot virtual qui est toujours unique pour une purchase line
         # mais aussi la table lot_qt dont le lot_p est ce lot virtuel (ajuster lot_quantity)
@@ -1495,8 +1501,6 @@ class Line(metaclass=PoolMeta):
         old_values = {}
 
         for records, values in zip(args[::2], args[1::2]):
-            if {'from_del', 'to_del'} & set(values):
-                cls._check_delivery_period_values(records, values)
             if 'quantity_theorical' in values:
                 for record in records:
                     old_values[record.id] = record.quantity_theorical
diff --git a/modules/purchase_trade/sale.py b/modules/purchase_trade/sale.py
index ab65843..cf829d3 100755
--- a/modules/purchase_trade/sale.py
+++ b/modules/purchase_trade/sale.py
@@ -1604,13 +1604,17 @@ class SaleLine(metaclass=PoolMeta):
 
     @classmethod
     def write(cls, *args):
+        actions = iter(args)
+        args = []
+        for records, values in zip(actions, actions):
+            cls._check_delivery_period_values(records, values)
+            args.extend((records, values))
+
         Lot = Pool().get('lot.lot')
         LotQt = Pool().get('lot.qt')
         old_values = {}
 
         for records, values in zip(args[::2], args[1::2]):
-            if {'from_del', 'to_del'} & set(values):
-                cls._check_delivery_period_values(records, values)
             if 'quantity_theorical' in values:
                 for record in records:
                     old_values[record.id] = record.quantity_theorical
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index d21542d..c0233e4 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -595,6 +595,14 @@ class PurchaseTradeTestCase(ModuleTestCase):
             SaleLine._check_delivery_period_values([valid], {
                 'to_del': datetime.date(2026, 3, 31),
             })
+        with self.assertRaises(UserError):
+            PurchaseLine._check_delivery_period_values([invalid], {
+                'quantity': Decimal('1'),
+            })
+        with self.assertRaises(UserError):
+            SaleLine._check_delivery_period_values([invalid], {
+                'quantity': Decimal('1'),
+            })
 
     def test_pricing_eod_uses_weighted_average_for_manual_rows(self):
         'manual pricing eod uses the weighted average of fixed and unfixed legs'