Sales return in Retail Mobile POS Delivery app

This process represent the sales return in retail mobile POS delivery app.

Business rules

In item in transit screen, delivery boy can Un-select the items which is return by customers and then click on save function key.
Once returned items get saved in delivery app, mobile system will ask to enter the reason for return and also it will ask to select return type.
Available return types are cash return or sales return slip generation. Based on customer requirements delivery boy will select the return type.
When a the customer returns an item at the time of delivery then the delivery boy can save the return amount as cash(if the delivery boy returns the cash at the time of delivery itself) or can save it has Sales Return Slip(the return amount will be adjusted in the future purchases) in app.
If Items Returned using Sales Return Slip, Then that created sales Return Slip no will be used in Sales Return with Exchange entry in POS.
The return bill should affect the POS system’s sales and stock.