Profit & Loss Statement

Profit & Loss Statement

I am new to Zoho Books.  When I run a P&L statement, cost of goods is always shown with a zero balance.  In my items, I have set up my COG account.  I have about 25 invoices so far, but none have generated COG data for this report.

Any ideas what I am supposed to do to get this set up?

Thanks,

Jerrid