How to show data from EKKO & EKPO table using BSP application

Dear All,

         I want to show the data from EKKO & EKPO table using BSP application with page.

Here input are BEDAT (PO date ) and Vendor (LIFNR) according to it show the po no.,item no & material no.

As i am new to BSP kindly help me.I created the design in layout tab but i am not getting how to fetch data & how to declare internal table.

Thanks & Regards,

Samadhan Shinde