Around 2000 i found that if you have document with header/footer with auto page numbers and merge it with few pages from other document also with page numbers you get huge mess in numbering.
Some weird happens like: 1, 2, 3, 4, 5, 6, (here is doc N:2) 20, 21, 22, 23, 24, (continues doc N:1) 7, 8, 9
And you can't just reset page numbers, because you need to be on inserted page and there to do reset.
Around 2000 i found that if you have document with header/footer with auto page numbers and merge it with few pages from other document also with page numbers you get huge mess in numbering.
Some weird happens like: 1, 2, 3, 4, 5, 6, (here is doc N:2) 20, 21, 22, 23, 24, (continues doc N:1) 7, 8, 9
And you can't just reset page numbers, because you need to be on inserted page and there to do reset.