Currently, Alma creates a link between a full bib heading with an authority that has exactly the same subfields.
For instance:

650 7 $$a Sports $$x Gestion. $$2 ram
Will fully link with authority:
150 _ $$a Sports $$x Gestion (ID: FRBNF11965041)

If Alma cannot match an authority with the full heading, then it attempts to link the first subfield of the heading with an authority:

650 7 $$a Sports $$x Gestion $$z France $$y 1990-2020. $$2 ram
Will (partially) link with authority
150 _ $$a Sports(ID: FRBNF13318890)
The other subfields will remain unlinked and therefore not under authority control.

This behavior is problematic for subject vocabularies that allow constructing headings from various authorities (precoordinated subject indexing). LCSH and Rameau work this way. Headings that do not match exactly with an authority are only partially linked and subfields following the linked subfields (i.e. subdivision headings) do not benefit from authority control. This is especially problematic when a subdivision authority is changed, for all subdivisions in the subject heading will remain the same.

A recent example with Rameau is the chronological subdivision ""1990-..."" that changed to ""1990-2020""." When the authority was changed, no subject headings in the bib records were updated, because subfield “$$y 1990-...” is not under authority control.

Heading “650 _7 $$a Sports $$x Gestion $$z France $$y 1990-..... $$2 ram” should have been updated into:
650 _7 $$a Sports $$x Gestion $$z France $$y 1990-2020. $$2 ram
But Alma didn’t do it. Librarians had to do it themselves using normalization rules.

Alma should have the ability to link not only the first subfield of a subject heading but each part of the heading that has a corresponding authority. More specifically, Alma should be able to search for authorities at least for subfields x,y and z.

For heading “650 7 $$a Sports $$x Gestion $$z France $$y 1990-2020. $$2 ram”, Alma should search for corresponding authorities for each subfields:
$$a Sports -> 150 _ $$a Sports
$$x Gestion -> 180 __ $$x Gestion
$$z France -> 181 __ $$z France
$$y 1990-2020 -> 182 __ $$y 1990-2020

There will be cases where some parts of the heading will not match with any authorities (for instance, subfields $$d or subfields $$x when the term is not used alone, but always in a composed heading), but this behavior would be much more satisfying than the current one.