diff --git a/addons/stock/wizard/stock_partial_picking.py b/addons/stock/wizard/stock_partial_picking.py
index b3720b8a51b..e2fefc0a4c2 100644
--- a/addons/stock/wizard/stock_partial_picking.py
+++ b/addons/stock/wizard/stock_partial_picking.py
@@ -38,7 +38,6 @@ class stock_partial_picking_line(osv.TransientModel):
             res[tracklot.id] = tracking
         return res
 
-
     _name = "stock.partial.picking.line"
     _rec_name = 'product_id'
     _columns = {
@@ -56,6 +55,21 @@ class stock_partial_picking_line(osv.TransientModel):
         'tracking': fields.function(_tracking, string='Tracking', type='boolean'), 
     }
 
+    def onchange_method_product_id(self, cr, uid, ids, product_id, uom_id, context=None):
+        if product_id:
+            product = self.pool.get('product.product').browse(cr, uid, product_id, context=context)
+            return {'value': {'product_uom': product.uom_id.id}}
+        else:
+            return False
+        
+    def _get_product_uom(self, cr, uid, context=None):
+        product_uom = self.pool.get('ir.model.data').get_object(cr, uid, 'product', 'product_uom_unit')
+        return product_uom.id
+
+    _defaults = {
+        'product_uom': _get_product_uom,
+    }    
+
 class stock_partial_picking(osv.osv_memory):
     _name = "stock.partial.picking"
     _description = "Partial Picking Processing Wizard"
diff --git a/addons/stock/wizard/stock_partial_picking_view.xml b/addons/stock/wizard/stock_partial_picking_view.xml
index 7de85594a26..2e9970af53c 100644
--- a/addons/stock/wizard/stock_partial_picking_view.xml
+++ b/addons/stock/wizard/stock_partial_picking_view.xml
@@ -19,7 +19,7 @@
                     <separator string="Transfer Products" name="product_separator"/>
                     <field name="move_ids" context="{'hide_tracking': hide_tracking}">
                         <tree editable="bottom" string="Product Moves">
-                            <field name="product_id" />
+                            <field name="product_id" on_change="onchange_method_product_id(product_id, product_uom)"/>
                             <field name="quantity" />
                             <field name="product_uom" groups="product.group_uom"/>
                             <field name="tracking" invisible="1"/>