Alright, I think we got it!
So, I had been using the BO of RcvDtlSearch (seemed like it would be less bloated), but in fact I needed Receipt instead, in order to get that “transaction” quantity.
Still more work to do, but huzzah! Go @A.Baeisa !
To reiterate, this code did work just fine if you use the right BO:
By the way,
vs.
Well, it gets it done, at least.