I write a field in product.py:

        'english_name':fields.char('English Name', size=128, select=True),

and I want to add this field in the sale.order.line. If I should write a realted ? I try to write like this in sale.py:

'product_eng_id': fields.related('english_name','product_eng_id', type = "many2one", relation = "product.product" , string = 'english name',store=False),

But it also show the "name" instead of "english_name"..I don't know what's wrong,maybe the relation is not product.product?..My fields.related have some problems?