Inventory closing

Hi all

inventory closing of year 2011 is effecting in the ledger. can anyone explain me the procesdure of inventory closing and why my inv. closing is not effecting in the module. As when i am taking the trail balance it is showing in the trail balance as opening but when i generate the value of the inventory from the module it is showing very less. And when i generate the reconsiliation report from the GL it is showing the opening balance under “ledger balance” column but not showing in “balance inventory”