Problems with P&L & Accrual

I have found a problem with our NS General Ledger - and the NS accrual method of accounting.

When our consultant setup our NS accounting options - we chose "ACCRUAL" as our accounting method  - not CASH.

We just found out that it appears NS does not accurately perform routine accounting functions for accrual accounting.

For example - we issue a PO to a vendor on 12/11/2013 for $3,000.00.  It is received IR on 12/12/2013.  The PO is billed on 12/12/2013 with net 60 day terms.  GL activity for the PO & IR & Bill - shows that our purchasing GL COGS account - 5110 - Vendor Purchases - isn't affected or posted to duriong any of those (3) transactions - just main inventory account +  POs waiting to be billed + A/P.  ONLY when the vendor invoice is actually paid on 2/10/2014 - is the COGS Acct - 5110 - posted to and the