[kh99]

Sounds like you've pretty much got it figured out. Why not just make the same datamanager calls that are being made on the other datamanager? If you're only interested in having the text of the linked post update, then you probably only need to set_existing, [S]set('message'...)[/S], then save().

Edit: sorry, that second one would actually be setr('pagetext', $edit['message']). And you wouldn't want to duplicate all the calls made on the other post because you don't want to be changing the threadid or forumid, for instance.