Nirmala,
Adding to Bilal's reply... BC will allow you to have the same G/L Account for Inventory and Inventory Adj. As an Accountant, Accounting practice, GAAP, FASB, IFRS dictate that the Inventory Account, a Balance Sheet account, not be the same as the Inventory Adjustment account, an Income Statement account, in the COGS section.
Hope this helps.
Thanks,
Steve