We already have 2 rooms reserved with the AP discount at POR for Dec 15th - Dec 17th. My FIL recently decided to join us and is flying in on Dec 14th. When I tried to add Friday night to the ressie, I was told there was no availability. However, if you go to the website and type in 12/14-12/21, there is availability. It doesn't pop in if I put the 12/14-12/17 dates but does if I extend the stay. I know others have had this issue before and have booked the longer stay then altered the ressie later. Does this still work? I was scolded sternly by a rep over the phone last time we visited and were having issues booking the nights I wanted. I am just surprised that they would rather have the room empty on the hopes that some one would book a week out. 
Any ideas? Should I try with extended the ressie? And change later?
Thanks!

Any ideas? Should I try with extended the ressie? And change later?
Thanks!