Sorting of a belongsto relation in Nova

Hi all, I have a ressource that has a belongsto Relation with another ressource - let´s say invoice belongsto company. Now when I go into invoices and make the relation to company sortable, it will not sort by the company name, but by the company id. I have set the title on the company ressource obviously, but the sorting still sticks to the id. Is there a way to work arround this behaviour? Thanks Bastian