I'm not tech support but I believe can answer this question -- it's my understanding that this feature will not be available until they migrate AP to version 9.0. This will consolidate the transactions into one table instead of two (History and Current.)

They cannot make this move until development of the new of Adagio PO is completed. This is because they cannot break compatibility between PO and AP.

Perhaps Andrew can give us a "guestimate" / ETA?