If you see red dots next to your entries and it say's Not "Ready For Billing" then here are the steps to verify the entries or if you'd like to turn this feature off to prevent this process.
First click the top entry and click "Ready for Billing/Next" which will bring up the next entry and keep clicking this option until all entries have been verified. Once all red dots are gone you can Finalize your Invoice.
If you would like to turn this feature off go to Settings - System tab and click Edit Settings. Then uncheck "Verify Entries Before Billing" and "Verify Expenses Before Billing" and click Save. You might still see some entries that need to be verified that were saved during the time this feature was turned on but they will steadily disappear.