Sorry for the late reply.
It's hard to troubleshoot something like this via forum/emails. If it were me, I'd look at the asset balances in tables ANLC, ANEP, and ANEA to get a feel for the exact values on an asset and then post a retirement with ABAKN with the appropriate date. Maybe post 99% retirement as of 12/31 and then retire the full amount afterwards.
-nathan