More or less requires the same handling as with HeeftBetrekkingOpAndere. For heeftAlsHoofdZaak a simple patch can be done on the current zaak, adding the new hoofdzaak. For heeftAlsDeelzaak it is needed to patch the deelzaak, adding the current zaak as hoofdzaak. ZGW only allows for setting a hoofdzaak, not deelzaken.
Should already follow the changes mentioned in #485