Show based on filter select box instead of input box?

Hello,

I want to adjust an existing host template. So I added a new field to the template but I’m not able to set the ‘show based on filter’ to the needed value. I can only select existing fields but I can not enter anything or use ‘host.vars’ or something else because it is an select box instead of an input box. I’m using Director version 1.8.

If I create a new (fresh) host template, I’m able to enter anything into the ‘show based on filter’. At this stage, it is an input field instead of a select box.

Do you have a hint for me? Thank you.