I have created a new order in point of sale(point of sale --> Daily Operations --> Orders) and confirmed it. After that, i just returned the product(button --> Return Products). It created the new point of sale - order(for return), the previous point of sale - order's product qty has been automatically changed as negative. In that process i would like find the main order and its related returning order but in openerp 7.0 has no link between the order and return. How can i find the order related return?