Problem with RF transactions input screen

Hi,

I am new to EWM, I am trying to create an RF transaction with ODO Number ( Outbound Delivery order ) number as input and would display the Material item and quantity in the next screen. I had completed the screen design part. I would like to know the ODO number given at the first screen , how can  I get that value ODO number given in the screen how can I get that value to the PBO function module for that screen.

I had created header structure , table type for that .

Please suggest.

Thanks,

RG