admin.py

@admin.register(models.OwnersDetails)
class OwnersDetailsAdmin(admin.ModelAdmin):
    list_filter = ("name_organization",)
    search_fields = ["name_organization", "inn_organization"]
    list_display = ["get_sn", "inn_organization", "name_organization", "first_name", "last_name"]
    inlines = [DeviceInline, RepairOrderInline]

    @display(ordering='device__serial_number', description='Device')
    def get_sn(self, obj):
        return obj.device.serial_number