Encumbrance Accounting and Period Receiept Reversal

We are using Release 12.1.3 of EBS.  We have AP, PO, INV, GL, iProc installed and in production.  We accrue uninvoiced expense receipts at period end and we use encumbrance accounting.  The issue we are having is with the reversal of receipt accrual in the current accounting period.   The receipt accrual reduces the encumbrance amount by the amount of the accrual.  When we reverse the accrual, the encumbrance does not get increased by the amount of the accrual.  It seems as though we are forgetting to run a process.