Hell in point of sale

1.   def test_paid(self, cr, uid, ids, context=None):     
2.         """ Test all amount is paid for this order
3.        @return: True
4.        """
5.         for order in self.browse(cr, uid, ids, context=context):
6.             if order.lines and not order.amount_total:
7.                 return True
8.             if (not order.lines) or (not order.statement_ids) or \
9.                 Decimal(str(order.amount_total)) != Decimal(str(order.amount_paid)):
10.                 return False
11.         return True
    
    
    Coming from the point_of_sale module in addons, find the hell!
    
    I help you, this code bugs the point of sale when we change the price accuracy of OpenERP