Vendor Master Upload Problem with Check Box

Hi All,

I have a problem with Vendor Master Upload program. In one of the screen of XK01 transaction depending upon the PO Box, Postal Code, Other City and Other Region i have to check the PO Box w/o no check Box. So in my program after i check the PO Box, Postal Code, Other City and Other Region values how to write a code that i can check the PO Box w/o no. Or other wise how can i send value to the Po Box w/o no check box. field

Thanks in advance.