How do we remove Cost Period management from the GL closing cycle?

We are no longer using Inventory. We no longer have any inventory quantities.

All of our Purchase transactions are Expense (Receipt Accounting). After closing the 'final' cost period, after adjusting out all inventory. When trying to close General Ledger, we are receiving an error that the Cost Period was not opened/closed.

We do not want to continue opening/closing unnecessary Costing Periods.

How do we remove Cost Period management from the GL closing cycle?