Bill, I don't know but it may well be that OA isn't interested in working with AC at this level. Of course, you have spoken with them, and I haven't so you may be more informed that me.
Just consider though, OA has gone from being just a clearinghouse, to offering a full suite of solutions including a practice mgmt system, emr and patient portal. They are all accessible from OA's website and I assume they are at least somewhat integrated.
OA already has AC users billing through their clearinghouse. How much benefit will OA get from cooperating with AC? I do feel that AC should by trying to work with OA on this though. I suspect quite a few of their customers us OA for the clearing house.
We use OA clearinghouse and would like to get ERA into the V7 PM module. Looks like we can't, which is really a problem. I don't plan on increasing our costs by $150/month. I'm really disappointed that OA "is not on the list" because from my perspective they should be one of the top clearinghouses AC should be trying to work with for operation with the V7 capabilities. But its from my perspective, not AC's and not OA's, who both have different objectives from mine.