Koha needs to have some mechanism in place to track items a patron checked out in a particular session (this information clears every time a new patron is loaded. Maybe linked to when the last patron button is updated). It would then be helpful in being creating some kind of mechanism so that ISSUEQSLIP could print just the items you just checked out rather than everything today, or everything currently checked out altogether. I can narrow down something close to this session with some template toolkit and time logic, but that is rather complicated for some libraries, and isn't foolproof. It would be preferred if Koha kept track of checkout sessions and offered an easy to implement option in the slip template. This is very needed and common. You don't go the grocery store and get a receipt for everything you bought that day. Just for that transaction. This would line up with current practices.
As noted in bug 29335, this would be useful for both ISSUEQSLIP and CHECKINSLIP.
*** Bug 29335 has been marked as a duplicate of this bug. ***