[BENQ] Unknown channel lamptime (OH 3.1.0 stable)

[Alpoy]

Can't get the "lamptime" channel to work, get a warning message in openhab.log when saving the items.file.
The projector has been added through GUI (tcp-ip) and items added by text according to the docs.
Power channel seems to work fine so the binding works.

2021-08-18 14:42:35.810 [INFO ] [el.core.internal.ModelRepositoryImpl] - Loading model 'media.items'
2021-08-18 14:42:40.904 [WARN ] [nternal.handler.BenqProjectorHandler] - Unknown channel lamptime

Item definition:
Number projLampHour { channel="benqprojector:projector-tcp:7ce45d5de7:lamptime" }

Expected Behavior

Get the lamptime from the channel

Current Behavior

Warning message in openhab.log and no lamptime is being retrieved

Possible Solution

Steps to Reproduce (for Bugs)

Add a "lamptime" channel

Your Environment

OH 3.1.0 (stable)