15.5.1 Why are there no usable Items displayed in the New Item window, or why is it that Items cannot be created?
There might be no exhibit Items, or the user might not have official authority to create new Items. Either publish Items or assign official authority to the user who creates Items.
For details about how to publish Items, see 12.7.2 Setting an Item to Exhibit or Not exhibit. For details about how to assign official authority to users, see 12.2.2(2) Registering and changing the target users.