Non billable Delivery with pick ticket for ADC mobile picking?

We have a nice Sage X3 puzzle, here it goes:

We want to pick from new ADC mobile webapp the stock to be issued on a non-billable delivery;

We create an order to have the pick ticket, I think we cannot have pick tickets without orders;

Then we pick the stock for that pick ticket, then we issue the goods from the delivery;

If the delivery is non-billable we cannot use it to select pick tickets, seems by design;

If we use delivery normal then we cannot close it before issuing the Invoice, seems by design;

Any standard guess?