An admin user cannot specify a primary key for entities that have a String field as the primary key

[phillipuniverse]

The example is BroadleafCurrency. The primary key (as in, the field annotated with @Id) is a String for the currency code. We are explicitly hiding @Id fields in the admin, but this does not fall under the category of a sequence generator since it's not a number field but something that should be entered.

Because of this, you cannot add instances of a BroadleafCurrency in the system (although this is currently not enabled in the admin out of the box).