gift receipt status

We are using a separate system to handle our online contributions, and that system sends out an electronic receipt upon payment. Hence in BBCRM, when processing those revenue items, we want to just update the receipt status to “Receipted” or perhaps even some sort of custom status of “Receipted in system xyz”.

Has anyone done this before, perhaps as a batch extension? Is there any repercussions in the system, to have it marked this way, without having used the receipt batch?

Thanks!