def METHOD_NAME(self):
    super().METHOD_NAME()
    if self.ztc_service and self.zaaktype:
        if not self.zaaktype.startswith(self.ztc_service.api_root):
            raise ValidationError(
                {"zaaktype": _("ZAAKTYPE is not part of the Catalogi API")}
            )
    if self.ztc_service and self.informatieobjecttype:
        if not self.informatieobjecttype.startswith(self.ztc_service.api_root):
            raise ValidationError(
                {
                    "informatieobjecttype": _(
                        "INFORMATIEOBJECTTYPE is not part of the Catalogi API"
                    )
                }
            )