I'm trying to lock the "Stage" field to a certain value so that when the users create a new Deal, they cannot modify the Stage.

I've set up a Client Script, and it works when the Deal is created normally. The problem is, most users use a Wizard to create the Deal, and the Client Script doesn't work there.

I noticed there's a way to lock fields from the Wizard settings, but the field "Stage" is not listed there. I believe it's because the "Stage" is a system field, but I'm not sure.

Something else I tried was removing the "Stage" field from the Wizard, given that there's a default value already set, but I get an error when trying to save it.

How can I lock the "Stage" field while using a Wizard?