Changing @SessionScoped to @ViewScoped makes entity creation to silently fail

To reproduce:
roo script bikeshop.roo
Edit SupplierBean and add
@ManagedBean(name = "supplierBean")
@ViewScoped
mvn jetty:run
Create Supplier won't show the creation dialog and there is no console log.

Is SessionBean the proper scope to be the default one? I try to avoid it because it usually makes things to not be refreshed when they should..

Regards.