In the new TM30 system, after registering, adding the address, and then wanting to make a notification. Does anyone know how to deal with the required field "check-out date"?

It is registered as a household. It´s a permanent address, with yellow book and all. Being here on a yearly extension. There is no scheduled check-out date..

So do I put the end date of my extension? It´s a required field, and not possible to leave blank.

If no-one knows, I guess I will ask immigration when I go there next month to apply for the extension again.