diff --git a/addons/mrp/mrp.py b/addons/mrp/mrp.py
index 7ff0cee5619..5603327290d 100644
--- a/addons/mrp/mrp.py
+++ b/addons/mrp/mrp.py
@@ -446,16 +446,16 @@ class mrp_production(osv.osv):
         'origin': fields.char('Source Document', size=64, help="Reference of the document that generated this production order request."),
         'priority': fields.selection([('0','Not urgent'),('1','Normal'),('2','Urgent'),('3','Very Urgent')], 'Priority'),
 
-        'product_id': fields.many2one('product.product', 'Product', required=True, ),
+        'product_id': fields.many2one('product.product', 'Product', required=True, readonly=True, states={'draft':[('readonly',False)]}),
         'product_qty': fields.float('Product Qty', required=True, states={'draft':[('readonly',False)]}, readonly=True),
         'product_uom': fields.many2one('product.uom', 'Product UOM', required=True, states={'draft':[('readonly',False)]}, readonly=True),
         'product_uos_qty': fields.float('Product UoS Qty', states={'draft':[('readonly',False)]}, readonly=True),
         'product_uos': fields.many2one('product.uom', 'Product UoS', states={'draft':[('readonly',False)]}, readonly=True),
 
         'location_src_id': fields.many2one('stock.location', 'Raw Materials Location', required=True,
-            help="Location where the system will look for components."),
+            readonly=True, states={'draft':[('readonly',False)]}, help="Location where the system will look for components."),
         'location_dest_id': fields.many2one('stock.location', 'Finished Products Location', required=True,
-            help="Location where the system will stock the finished products."),
+            readonly=True, states={'draft':[('readonly',False)]}, help="Location where the system will stock the finished products."),
 
         'date_planned_end': fields.function(_production_date_end, method=True, type='date', string='Scheduled End Date'),
         'date_planned_date': fields.function(_production_date, method=True, type='date', string='Scheduled Date'),
@@ -463,8 +463,8 @@ class mrp_production(osv.osv):
         'date_start': fields.datetime('Start Date', select=True),
         'date_finished': fields.datetime('End Date', select=True),
 
-        'bom_id': fields.many2one('mrp.bom', 'Bill of Material', domain=[('bom_id','=',False)]),
-        'routing_id': fields.many2one('mrp.routing', string='Routing', on_delete='set null', help="The list of operations (list of work centers) to produce the finished product. The routing is mainly used to compute work center costs during operations and to plan future loads on work centers based on production plannification."),
+        'bom_id': fields.many2one('mrp.bom', 'Bill of Material', domain=[('bom_id','=',False)], readonly=True, states={'draft':[('readonly',False)]}),
+        'routing_id': fields.many2one('mrp.routing', string='Routing', on_delete='set null', readonly=True, states={'draft':[('readonly',False)]}, help="The list of operations (list of work centers) to produce the finished product. The routing is mainly used to compute work center costs during operations and to plan future loads on work centers based on production plannification."),
 
         'picking_id': fields.many2one('stock.picking', 'Picking list', readonly=True, ondelete="restrict",
             help="This is the internal picking list that brings the finished product to the production plan"),