how to add tab and field in purchase order

hi friends,

I have to make changes in the purchase order. i have to add tab and a field in that.

i know that badi ME_GUI_PO_CUST have to used this.

can anyone send me the code or documenation fot add a tab and field using this badi or suggest me how to do this.

if code or documenation is not available then send me the steps if possible.

my mail id is hitesh.kumar@prospectasoftware.com

mrhitesh2006@yahoo.co.in

hitesh kumar