INVIDITM how to change user item type as read only on form, but updatable by template ?

Hello,

We need to have the user item type to be changed only using Item templates and never directly manually in form.

In our templates, many items attributes are defined based on the item type.

If user changes manually the field on the form, all other attributes are not changed. We need therefore to remove the ability to change the item type directly on the form.

Would anybody know how to create a form personalization for that ?

I creted one that was changing the field as UPDATE_ALLOWED = FALSE.

Field was effectively not updatable (greyed out) on the form, but it was also not possible to change the item type when using a template.