Purchase rate

at the time of billing the purchase rate can only be seen while adding the item in case of bulk order we are not able to understand the purchase rate easily if so we can adjust the sale price easily at the time of billing to the customer. it is not easy to remember the purchase rates of all item. it is very helpful if the purchase rate is denoted any where corresponding to each product on the billing screen either by clicking on the item and the purchase rate should not be visible on the bill that we gave to our costumer