Thanks Frank.
Since you have written an enhancement request, I have one more comment on this topic.
In previous versions of the rooms and reservations database, when the owner opened a reservation request to accept/decline, she could see the number of invitees.
In the latest version, this information is no longer visible.
I checked the documents and saw that the field "Capacity" had the info but was not visible. I added a computed text on the form to display this info for the room owner.
This solved the issue but there may be other users who have the same need...