diff --git a/addons/sale_stock/sale_stock.py b/addons/sale_stock/sale_stock.py
index 9f45bf0be59..c7f0684d38e 100644
--- a/addons/sale_stock/sale_stock.py
+++ b/addons/sale_stock/sale_stock.py
@@ -323,10 +323,9 @@ class sale_order_line(osv.osv):
 
     def product_id_change(self, cr, uid, ids, pricelist, product, qty=0,
             uom=False, qty_uos=0, uos=False, name='', partner_id=False,
-            lang=False, update_tax=True, date_order=False, packaging=False, fiscal_position=False, flag=False, context=None):
+            lang=False, update_tax=True, date_order=False, packaging=False, fiscal_position=False, flag=False, warehouse_id=False, context=None):
         context = context or {}
         product_uom_obj = self.pool.get('product.uom')
-        partner_obj = self.pool.get('res.partner')
         product_obj = self.pool.get('product.product')
         warning = {}
         res = super(sale_order_line, self).product_id_change(cr, uid, ids, pricelist, product, qty=qty,
@@ -341,27 +340,48 @@ class sale_order_line(osv.osv):
         product_obj = product_obj.browse(cr, uid, product, context=context)
         res['value']['delay'] = (product_obj.sale_delay or 0.0)
 
-        #check if product is available, and if not: raise an error
-        uom2 = False
-        if uom:
-            uom2 = product_uom_obj.browse(cr, uid, uom)
-            if product_obj.uom_id.category_id.id != uom2.category_id.id:
-                uom = False
-        if not uom2:
-            uom2 = product_obj.uom_id
-
         # Calling product_packaging_change function after updating UoM
         res_packing = self.product_packaging_change(cr, uid, ids, pricelist, product, qty, uom, partner_id, packaging, context=context)
         res['value'].update(res_packing.get('value', {}))
         warning_msgs = res_packing.get('warning') and res_packing['warning']['message'] or ''
-        compare_qty = float_compare(product_obj.virtual_available * uom2.factor, qty * product_obj.uom_id.factor, precision_rounding=product_obj.uom_id.rounding)
-        if (product_obj.type=='product') and int(compare_qty) == -1:
-          #and (product_obj.procure_method=='make_to_stock'): --> need to find alternative for procure_method
-            warn_msg = _('You plan to sell %.2f %s but you only have %.2f %s available !\nThe real stock is %.2f %s. (without reservations)') % \
-                    (qty, uom2 and uom2.name or product_obj.uom_id.name,
-                     max(0,product_obj.virtual_available), product_obj.uom_id.name,
-                     max(0,product_obj.qty_available), product_obj.uom_id.name)
-            warning_msgs += _("Not enough stock ! : ") + warn_msg + "\n\n"
+
+        #determine if the product is MTO or not (for a further check)
+        isMto = False
+        if warehouse_id:
+            warehouse = self.pool.get('stock.warehouse').browse(cr, uid, warehouse_id, context=context)
+            for product_route in product_obj.route_ids:
+                if warehouse.mto_pull_id and warehouse.mto_pull_id.route_id and warehouse.mto_pull_id.route_id.id == product_route.id:
+                    isMto = True
+                    break
+        else:
+            try:
+                mto_route_id = self.pool.get('ir.model.data').get_object(cr, uid, 'stock', 'route_warehouse0_mto').id
+            except:
+                # if route MTO not found in ir_model_data, we treat the product as in MTS
+                mto_route_id = False
+            if mto_route_id:
+                for product_route in product_obj.route_ids:
+                    if product_route.id == mto_route_id:
+                        isMto = True
+                        break
+
+        #check if product is available, and if not: raise a warning, but do this only for products that aren't processed in MTO
+        if not isMto:
+            uom2 = False
+            if uom:
+                uom2 = product_uom_obj.browse(cr, uid, uom)
+                if product_obj.uom_id.category_id.id != uom2.category_id.id:
+                    uom = False
+            if not uom2:
+                uom2 = product_obj.uom_id
+            compare_qty = float_compare(product_obj.virtual_available * uom2.factor, qty * product_obj.uom_id.factor, precision_rounding=product_obj.uom_id.rounding)
+            if (product_obj.type=='product') and int(compare_qty) == -1:
+              #and (product_obj.procure_method=='make_to_stock'): --> need to find alternative for procure_method
+                warn_msg = _('You plan to sell %.2f %s but you only have %.2f %s available !\nThe real stock is %.2f %s. (without reservations)') % \
+                        (qty, uom2 and uom2.name or product_obj.uom_id.name,
+                         max(0,product_obj.virtual_available), product_obj.uom_id.name,
+                         max(0,product_obj.qty_available), product_obj.uom_id.name)
+                warning_msgs += _("Not enough stock ! : ") + warn_msg + "\n\n"
 
         #update of warning messages
         if warning_msgs:
diff --git a/addons/sale_stock/sale_stock_view.xml b/addons/sale_stock/sale_stock_view.xml
index e786f32e583..efc3d40adde 100644
--- a/addons/sale_stock/sale_stock_view.xml
+++ b/addons/sale_stock/sale_stock_view.xml
@@ -29,17 +29,17 @@
                     <field name="client_order_ref" position="after">
                          <field name="warehouse_id" on_change="onchange_warehouse_id(warehouse_id)" widget="selection" groups="stock.group_locations"/>
                     </field>
-                   <field name="product_id" position="replace">
+                   <xpath expr="//page[@string='Order Lines']/field[@name='order_line']/tree[@string='Sales Order Lines']/field[@name='product_id']" position="replace">
                        <field name="product_id"
                        context="{'partner_id':parent.partner_id, 'quantity':product_uom_qty, 'pricelist':parent.pricelist_id, 'uom':product_uom}"
                        groups="base.group_user" 
-                       on_change="product_id_change(parent.pricelist_id,product_id,product_uom_qty,product_uom,product_uos_qty,product_uos,name,parent.partner_id, False, True, parent.date_order, product_packaging, parent.fiscal_position, False, context)"/>
-                   </field>
-                   <field name="product_uom_qty" position="replace">
+                       on_change="product_id_change(parent.pricelist_id,product_id,product_uom_qty,product_uom,product_uos_qty,product_uos,name,parent.partner_id, False, True, parent.date_order, product_packaging, parent.fiscal_position, False, parent.warehouse_id, context)"/>
+                   </xpath>
+                   <xpath expr="//page[@string='Order Lines']/field[@name='order_line']/tree[@string='Sales Order Lines']/field[@name='product_uom_qty']" position="replace">
                        <field context="{'partner_id':parent.partner_id, 'quantity':product_uom_qty, 'pricelist':parent.pricelist_id, 'uom':product_uom}"
-                             name="product_uom_qty" class="oe_inline"
-                           on_change="product_id_change(parent.pricelist_id,product_id,product_uom_qty,product_uom,product_uos_qty,product_uos,name,parent.partner_id, False, False, parent.date_order, product_packaging, parent.fiscal_position, True, context)"/>
-                   </field>
+                             name="product_uom_qty" 
+                       on_change="product_id_change(parent.pricelist_id,product_id,product_uom_qty,product_uom,product_uos_qty,product_uos,name,parent.partner_id, False, False, parent.date_order, product_packaging, parent.fiscal_position, True, parent.warehouse_id, context)"/>
+                   </xpath>
 
                    <field name='invoiced' position="after">
                        <field name="shipped"/>