Internal Table

hai pls solve me this ,

i am extracting data from internal table(I_VBKD) using read statement like this

READ TABLE I_VBKD WITH KEY vbeln = I_AFPO-kdauf

BINARY SEARCH.

but i am getting the same results as because of the headerline,

if i clear the I_AFPO then i didn't get any data.can u pls help me