I have seen your reply to Robert (very informative as always, thanks!) but I have some additional questions.
I have to achieve the following: I'm implementing an invoicing app, where it is possible that an invoice is multiple pages long, and at the bottom of each page (except the last) I have to implement "carry over to next page" sums of net and gross amount, and on each page (except the first) I have to show the same values at the top as "carry over from previous page". The carry overs are not only the sums on that page, but the sums from the start of the item list to that point (all pages accumulated thus far).
So indeed, I could imagine some new bands called "dataPageEndBreak"/"dataPageStartBreak", that we could configure to achieve the above...

TIA,
Peter