incomplete sales order to block delivery note creation

Hello experts,

I use the incomplete procedure on the sales order and save the order with one field not filled in. So this sales order is incomplete, but seems user can still create delivery note for the order.

In the "status group" IMG, there is one check box for delivery, I tick it on, but still the delivery note can be created even the sales order is incomplete for that field.

Anything missing here or this is as expected? Thanks!