When creating new rooms (packages) in ResOnline, ensure that these are also mapped into ResBook. If they are not, bookings will not flow into ResBook.
Step 1 - Log into ResBook and go to ResOnline > Settings
Step 2 - Insert Rate Package ID by clicking on Fetch Rate Packages for the corresponding room.
Step 3 - Tick the Room and Click [Insert] as per screenshot example:
Step 4 - Save Changes and then click Update inventory to ensure that your inventory syncs.