Enter the UTILITIES menu from the Opera main menus. After then enter the Synchronize Utilities=>Synchronize Inventory menu.
FROM DATE section arrives selected as today's date, enter the end of month date to TO DATE section and press OK.
When the synchronization is complete, a screen as below will appear.
Then enter to the Synchronize Utilities=>Synchronize Physical Rooms menu.
On property, select your hotel code with X and press OK.
When the synchronization process is complete, a screen as below will appear. After pressing OK, exit the screen with CLOSE. Check your screens again with Shift F2 and Ctrl F3.