Thank you, the message disappeared after a bit of tinkering:
- I checked all the devices using the RFX on the page and all of them were configured properly, I even re-selected the state popup but the messages were still happening.
- to find out who was the culprit, I created another test control page and cut-copy the devices from the problematic control page to the test one. The error messages happened until I transferred the last two devices ! happily I check the test control page expecting to see the error messages, and they do not appear...
- I transfer back the two suspect devices to the original problematic control page, and everything works fine, no more error messages...
- so I transfer back all of the devices related to the RFX to the original problematic control page and no more error messages, the problematic control page is now a totally functional control page.
- I go get a beer and enjoy life !