I will also add that, at first using the multi one did not work for me. And at first I coded each new map with it's own region code. Apparently when changing the features to that of the other map it does *not* bring over the region numbers. They all still stay the same. So! In the end I put exactly the same region code on all 6 of my maps. And it works. So my numbers look like.
<regionmap 1,2,1;1,3,2;1,4,3;> And so on. Notice the region code being exactly the same in all of them.
Course maybe mine is just being weird! I dunno!