Maximum number of dhcp reservations

I am using an airport extreme (3rd gen, latest firmware).
I added 26 DHCP reservations.
Now I want to add some more.
Problem is: The ´+´ button is gray, only the ´-´ button is black.
using the EDIT button changes an existing entry and overwrites it.
Is there any limitation of the number for dhcp reservations?
How can I add new one?
Thanks for your help.
Stefan

Apple Please fix this.

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