Occurrences sometimes use the wrong ex author of a name. For name matching and clarity it would make sense to create explicit synonyms for those authorships.
For example for the name "Vernonia retusa Sch.Bip. ex H.Rob." we would also create "Vernonia retusa Sch. Bip." in our backbone being a homotypic synonym of the former.
It would also allow us to make use of the kingdom classification to understand the order of ex authors correctly. Botanical names put the later, accepted author last, while zoologist do it usually the other way around.
See 46.5 in botanical code: