Reuse Finished product

Hi all,

My scenerio is mentioned below.

1. We send the finished product to FPS(Finished product Stores) were delivery is created and the products are send to the customers.

2. If the customer does not want the product due to some reasons, No delivery is created and these Finished products gets accumulated in the FPS.

3. After some period there may be requirement for the product from the customer with little modification. The FPS issues the material to the Production location. After the modification the finished product is send to the FPS and delivery is made to the customer.

How to map the above scenerio in SAP ?

Regards

Afzal