Roamer is a watch brand from Switzerland and they want to calculate the total watch revenue of the R Line System Line up. In order to generate the watch revenue, initially the watch records are retrieved for all of the watches in the record file, where the records are also validated. The validated records are then used to calculate the net price. For calculating the net price, the cost price is initially calculated using the watch id, and materials information. From the cost price, tax withheld is calculated using the tax rate for specific watch id and thus the net price of every watch is updated. Furthermore, process sales determines the total price for any watch, according to the order id and watch id. The orders are also verified by their order id and then classified into regular orders or bulk orders. For the regular order, the regular price is calculated and the regular invoice is returned. However for the bulk orders, a discount is retrieved, and then the discounted price is calculated from which the bulk invoice would be sent. Finally, after the total price is collected from the invoice, a checkout is printed of the total price.

Draw a structured chart for the mentioned details.