TM creation of freight units for sales order positions

Dear TM-Experts,

After execution of all TM-integration settings I can build freight units when sales order (VA01) will be created:

Example: 1 sales order with 2 items:

I get one freight unit with 2 positions:

Well it works so far, but my question is: is it possible that one freight unit will be created for every sales order item and NOT for the whole sales order?

Honestly I thought, that this settings in freight unit build rule is responsible for such a split:

But even with this setting I get only one freight unit for the whole sales order.

Could you give me any tips for this?

Thanks in advance and BR.

Denis.