Different entities for same field not possible

[toirl]

Entities represent a field in the datamodel by their fieldname.
Entties are referenced in the form to include a field in the form.
Depending on the form the fields might have different configurations. The most obvious might be to render fields with different renderers or rules.

As Formbar internally stores the fields by their name and not by their id it is currently not possible to have different entities for the same field