diff --git a/tryton/modules/purchase/purchase.py b/tryton/modules/purchase/purchase.py
index faf35cecfa..bb564ff9f4 100644
--- a/tryton/modules/purchase/purchase.py
+++ b/tryton/modules/purchase/purchase.py
@@ -1091,16 +1091,13 @@ class Line(sequence_ordered(), ModelSQL, ModelView):
             'company': Eval('company', None),
             },
         search_context={
-            'locations': If(Bool(Eval('_parent_purchase', {}).get(
-                        'warehouse')),
-                [Eval('_parent_purchase', {}).get('warehouse', None)],
-                []),
-            'stock_date_end': Eval('_parent_purchase', {}).get(
-                'purchase_date'),
+            'locations': If(Bool(Eval('warehouse')),
+                [Eval('warehouse', -1)], []),
+            'stock_date_end': Eval('purchase_date', None),
             'stock_skip_warehouse': True,
-            'currency': Eval('_parent_purchase', {}).get('currency'),
-            'supplier': Eval('_parent_purchase', {}).get('party'),
-            'purchase_date': Eval('_parent_purchase', {}).get('purchase_date'),
+            'currency': Eval('currency', -1),
+            'supplier': Eval('supplier', -1),
+            'purchase_date': Eval('purchase_date', None),
             'uom': Eval('unit'),
             'taxes': Eval('taxes', []),
             'quantity': Eval('quantity'),
@@ -1119,7 +1116,7 @@ class Line(sequence_ordered(), ModelSQL, ModelView):
                     ('product', '=', Eval('product')),
                     ],
                 []),
-            ('party', '=', Eval('_parent_purchase', {}).get('party')),
+            ('party', '=', Eval('supplier', -1)),
             ],
         states={
             'invisible': Eval('type') != 'line',
@@ -1153,8 +1150,7 @@ class Line(sequence_ordered(), ModelSQL, ModelView):
         domain=[('parent', '=', None), ['OR',
                 ('group', '=', None),
                 ('group.kind', 'in', ['purchase', 'both'])],
-                ('company', '=',
-                    Eval('_parent_purchase', {}).get('company', -1)),
+                ('company', '=', Eval('company', -1)),
             ],
         states={
             'invisible': Eval('type') != 'line',
@@ -1170,6 +1166,9 @@ class Line(sequence_ordered(), ModelSQL, ModelView):
     move_done = fields.Function(fields.Boolean('Moves Done'), 'get_move_done')
     move_exception = fields.Function(fields.Boolean('Moves Exception'),
             'get_move_exception')
+    warehouse = fields.Function(fields.Many2One(
+            'stock.location', "Warehouse"),
+        'on_change_with_warehouse')
     from_location = fields.Function(fields.Many2One('stock.location',
             'From Location'), 'get_from_location')
     to_location = fields.Function(fields.Many2One('stock.location',
@@ -1437,6 +1436,11 @@ class Line(sequence_ordered(), ModelSQL, ModelView):
             return amount
         return Decimal('0.0')

+    @fields.depends('purchase', '_parent_purchase.warehouse')
+    def on_change_with_warehouse(self, name=None):
+        if self.purchase and self.purchase.warehouse:
+            return self.purchase.warehouse.id
+
     def get_from_location(self, name):
         if (self.quantity or 0) >= 0:
             if self.purchase.party.supplier_location:
diff --git a/tryton/modules/sale/sale.py b/tryton/modules/sale/sale.py
index 1b0e36a3b3..d628a9d2be 100644
--- a/tryton/modules/sale/sale.py
+++ b/tryton/modules/sale/sale.py
@@ -1143,13 +1143,13 @@ class SaleLine(TaxableMixin, sequence_ordered(), ModelSQL, ModelView):
             'company': Eval('company', None),
             },
         search_context={
-            'locations': If(Bool(Eval('_parent_sale', {}).get('warehouse')),
-                [Eval('_parent_sale', {}).get('warehouse', 0)], []),
-            'stock_date_end': Eval('_parent_sale', {}).get('sale_date'),
+            'locations': If(Bool(Eval('warehouse')),
+                [Eval('warehouse', -1)], []),
+            'stock_date_end': Eval('sale_date', None),
             'stock_skip_warehouse': True,
-            'currency': Eval('_parent_sale', {}).get('currency'),
-            'customer': Eval('_parent_sale', {}).get('party'),
-            'sale_date': Eval('_parent_sale', {}).get('sale_date'),
+            'currency': Eval('currency', -1),
+            'customer': Eval('customer', -1),
+            'sale_date': Eval('sale_date', None),
             'uom': Eval('unit'),
             'taxes': Eval('taxes', []),
             'quantity': Eval('quantity'),
@@ -1186,8 +1186,7 @@ class SaleLine(TaxableMixin, sequence_ordered(), ModelSQL, ModelView):
         domain=[('parent', '=', None), ['OR',
                 ('group', '=', None),
                 ('group.kind', 'in', ['sale', 'both'])],
-                ('company', '=',
-                    Eval('_parent_sale', {}).get('company', -1)),
+                ('company', '=', Eval('company', -1)),
             ],
         states={
             'invisible': Eval('type') != 'line',
@@ -1205,7 +1204,7 @@ class SaleLine(TaxableMixin, sequence_ordered(), ModelSQL, ModelView):
     move_exception = fields.Function(fields.Boolean('Moves Exception'),
             'get_move_exception')
     warehouse = fields.Function(fields.Many2One('stock.location',
-            'Warehouse'), 'get_warehouse')
+            'Warehouse'), 'on_change_with_warehouse')
     from_location = fields.Function(fields.Many2One('stock.location',
             'From Location'), 'get_from_location')
     to_location = fields.Function(fields.Many2One('stock.location',
@@ -1430,6 +1429,11 @@ class SaleLine(TaxableMixin, sequence_ordered(), ModelSQL, ModelView):
     def get_warehouse(self, name):
         return self.sale.warehouse.id if self.sale.warehouse else None
 
+    @fields.depends('sale', '_parent_sale.warehouse')
+    def on_change_with_warehouse(self, name=None):
+        if self.sale and self.sale.warehouse:
+            return self.sale.warehouse.id
+
     def get_from_location(self, name):
         if (self.quantity or 0) >= 0:
             if self.warehouse:
diff --git a/tryton/modules/sale_product_customer/sale.py b/tryton/modules/sale_product_customer/sale.py
index 4f0c4cca41..f77870d05f 100644
--- a/tryton/modules/sale_product_customer/sale.py
+++ b/tryton/modules/sale_product_customer/sale.py
@@ -22,7 +22,7 @@ class Line(metaclass=PoolMeta):
                     ('product', '=', Eval('product')),
                     ],
                 []),
-            ('party', '=', Eval('_parent_sale', {}).get('party')),
+            ('party', '=', Eval('customer', -1)),
             ],
         states={
             'invisible': Eval('type') != 'line',