EDIT

once a name is known to be incorrect (has a name relation to the correcting name) it should no longer possible to

1. create a registration for this name
2. add any type data to an existing registration for this name
3. should such registration be rejected? automatically?

As a basis for discussion:

A given name must be available (selectable) for new Working sets.
That means: if an incorrect name was corrected, the corrected name is searchable = an epi- or lectotype, for instance, will be linked to this one.

If an incorrect name was not recognized as an incorrect one and registered as such, this name will apear in the selection and this one is available for epi- or lectotypes.

If an incorrect name is corrected, the incorrect name should be protected for linking types to the incorrect name.

An incorrect name once registered, can only be corrected by the curator (or admin). If, for instance, a holotype was already linked to the incorrect name, it may stay there. New types will linked to the corrected name after the name correction.

This could be a pragmatic way to handle these cases.
In Vaadin, I see no problems for user. Hope there will be no problems for the portal.