Determination of Item Category for Delivery when created w/o reference to Sales Order

Hi Gurus,

I have gone through SDN and I found 2 different answers to my below question. Can you please clarify?

As per my understanding, should we wish to create delivery w/o reference to Sales Order, then we need to perform below settings for delivery type :-

1. Order Required Field = No Preceding Document is required.

2. Default Order Field = Enter any Pseudo sales order type.

As per below link, in this scenario, item category and movement type is selected as follows :-

From Pseudo Sales Order Type -> Item Category -> Schedule Line Category -> Movement Type

Default order type, in ovlk

But as per the below link, item category is determined as follows :-

From a combination of Delivery Type + Item Cat. Grp. + Usage + Item Cat. of Higher level Item

Cash Sales: How Delivery Item Category is determined.

Which one is correct?

Thanks,

Debi