What version are you on?  When items are received into QC, the GL Posting for both sides (Inventory and PO/RNI) occurs and the transaction report will have a "Q" type transaction.  When they are accepted in PO-J-C, no GL posting occurs but you get 2 inventory transactions.  A negative "Q" type taking it out of QC and a positive "P" type.

We found more info on this problem. When a p/o is being enter and for what ever reason you go out of it in the first page of the p/o entry this create no problem, however, if you get out on the second page at the point you’re going to enter the items, the system prompt you with the question if you want to get out without saving the p/o you answer is yes, the result is, this p/o number is actually in the system with no information on the first page. Now you go back and enter the p/o using the same p/o number, and everything looks fine, but when you receive this p/o only half on the transaction gets register. What I mean is, on the transaction report you will only see the Q transaction and no P also the general ledger is out of balance because only the credit side is register.