Changing screen values as per up and down buttons

Hi All,

Im new to module pool programming.

I have a requirement if a user enters storage bin, warehouse and storage type the all materials related to such combination should be displayed but 1 at a time on screen.

It should up and down buttons and depending on its press it should display material , description and its quantiy and other details on screen.

Kindly help so as to design such screen . How can make scroll up and down movement which will show single item details at a time on screen.

Thanks.