Reverse and old batch ends up in the ADJ period instead of the same period

Hi,

Our Secondary Ledger for one of the countries is catching up with it's document sequencing and are being closed one by one.

Recently we upgraded from 12.06 to 12.1.3 and after doing a create accounting also entries for previous periods/ years (which were still open in the Secondary Legder) were created. For instance for 2015 we are reversing all these journals again. This goes find all reversal end up in the same period as they were reversed from except for AUG-15 and NOV-15 they end up in period ADJ-16.

I tried to manipulate the system by creating a Criteria Set to force the reversal to go to the same period but still they end up in  ADJ-16 instead of AUG-15 and NOV-15.