Well, first thing's first: those packages are both in the section "libs". As far as I know you can only manually promote packages that are in one of the "user" sections. So you can promote yosmapa (which it looks like you already did), but not its dependencies. The dependencies of packages not in "user" sections are supposed to auto-promote themselves when the package depending on them gets promoted. (That's how I got iw into extras-testing - I pushed a version of aircrack-ng into extras-testing from extras-devel that had iw as a dependency.)

Your situation - I THINK, I'm not sure - is probably slightly different because there are already versions of libosmgpsmap and python-osmgpsmap in Extras-Testing, and/or it's just a matter of time.

If you look at the "Status:" field for the two packages you linked to, at the time of this writing they are labeled "Package Promoted".

I think this means that when you promoted yosmapa they did get promoted with it, but for some reason the maemo repositories server glitched and hasn't uploaded them yet. Happens sometimes. If it doesn't import in another couple of hours to extras-testing, you can try version-bumping yosmapa and/or the dependencies and re-uploading, as that has helped me get builds of the aircrack-ng package "unstuck" before.

That said, I'm not 100% sure if this is the only issue, but you have taken care of the dependency fields in yosmapa correctly so far, and promoted yosmapa, so I can't think of any other reason for it not working yet, at least out of the issues I've encountered with the repositories thus far.