How to tell if billing has been posted
Click on the specific charge, adjustment, or payment for the date range you are looking at. From there, click on the Billing tab. If the status says "Posted" then it has been posted to the accounting system. If it's posted, it will be assigned a batch number and will display the date posted. Posted items cannot be modified.
When the status says "Ready to Post", you can make any changes needed, or re-generate billing.