It might be a good idea to allow for merit sources to specify if they are sending merit from their "source sMerit" or that is the result of the merit they received via their posts from others.
Conceptually there is a difference of course, but from a practical point of view, a merit is a merit when it hits the posters profile. It doesn't really matter what type of merit has been awarded. The real difference derives from the person awarding the merits. Merit sources are trusted by the administration, and in my opinion, wherever the merits came from, a breach of that trust is still a breach.