[Deprecated] DMZ 1.5.3 (DataMapper OverZealous Edition)

[eluser]OverZealous[/eluser]
Are 'zone' and 'pool_team' related items? (As opposed to being stored on the model directly.)

If so, then that's the issue. The hidden input type isn't really designed to handle relationships. Just normal, single values.

Only inputs that can have an array of possible values (dropdown, checkbox, and radio) can be used with relationship fields.

Why would you pass a related value in a hidden field, anyway?

If you have a good reason to pass that kind of information, then you can create your own input method helper. Instructions are in the docs.