does anyone know if its possible to add a few lines of code to be able to override the expiration date and the google checkout?

my issue is when i try to upload the file to google base its giving me an error that says "item's expiration date is greater than 31 days" and for google, i want to change it so <gayment_accepted>GoogleCheckout</gayment_accepted> is deleted from all feeds.

is this possible?

thanks!