Denver Research

I am having a problem with the time printed on open bills. When a customer opens a new bill, the time printed on the bill is correct.  However if half an hour later they order a new item, the newly updated bill does not print the updated time !  Currently, to update a bill, after updating, I then select the print copy button, then send order. Is there a different way whereby the time printed is correct as at when the operation takes place ?