Screenshot of Error Message:
Reason:
There is a feature in eZee Frontdesk, whereby we can allocate inventory business source wise and the inventory is defined, the system will not allow booking rooms beyond the allocated inventory.
Solution:
Deactivate this feature in eZee Frontdesk.
Path: eZee Frontdesk Configuration >> Advance Settings >> Rental >> (Uncheck) Enable Business source wise room type allocation.
Refer screenshot.