Printing text at the top line of a sapscript form

I'm trying to print date about 1cm from the top of a cheque, with standard header settings, but depsite giving the page window an upper margin of zero, it is printed about 1.3cm down the page. I've tried different settings but unable to get rid of this problem. How can i get it at top of the page? - Similar scenarios welcomed.

Regards,

Imran