By default the availability in the calendar is reflected in the value of the resource availability on the properties page, but not vice versa. Therefore it is better not to change the value of the availability field, but consistently to adjust the availability with the shifts. See [url=http://www.nbl.fi/that_man/Clarity/Resource_availablility_and_calendar.pdf]Resource availability and calendar[/url] for examples Martti K.
Your link points to "Resource_availablility_and_calendar.pdf" but I suppose you improved it and renamed to "Resource_availablility_and_calendar_v2.pdf" so previous link is failing.
Thanks to Martti for sharing all this information
Thanks for pointing that out.
I don't keep track were I put the links, so if I update a doc because of a typo or something and rename it the old refecenes don't work anymore if I maintain just one verion.
Not gonna do that anumore.