Hi Andrej,

the reason why you can't sort on multivalued fields in Solr is - how
would Solr decide which one of the multiple values it should use for
sorting?

In DSpace, the custom metadata fields are all defined as multivalued.
However, there is an additional field for sorting - the *_sort dynamic
field. Try these parameters:

&sort=dateissued.year_sort%20desc

&sort=diss.date.defence_sort%20desc


Regards,
~~helix84

Compulsory reading: DSpace Mailing List Etiquette
https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette

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