EDIT

Changing the rank of a name from e.g. an infraspecific rank to a non-infraspecific rank hides the the not-required fields (here the field for the infraspecific epithet) but does not delete the value.

So when saving the name the name is stored e.g. as a species but with a infra.spec. epithet set. This is not visible as the name formatter does not show the epithet. Only when changing the rank back to infraspecific or by checking the database it can be seen that the infr.spec. epithet was stored in the DB.

The same happens when e.g. switching on and off the "with basionym" checkbox and selecting a basionym. Even if the selected basionym is not visible anymore it will be stored.

As a first step the correct behaviour for changing values that do hide other fields (or more general do have an impact on other fields) should be defined. In a next step it should be implemented.
Also other forms should be checked for such inconsistencies.

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Developer notes: related classes: TaxonNamePopupEditor, TaxonNameEditorPresenter (maybe also TaxonNameStringFilterablePagingProvider and WeaklyRelatedEntityCombobox)