The idea is to make the Return Product operation similar to Void Product operation.
Selecting a product and clicking on Return Product changes the quantity to Negative however clicking return product on the same line should shift the quantity back to positive value.

This functionality will aid the end user in case the customer changes their mind to return a certain product (Product A) and wishes to return another product (Product B). The user can simply click the return product button again to change the negative quantity to positive.

Today the user has to void the product and then add the same item again which just adds to the cart checkout time.