Field help (SOHCAT2) @ L.V. Expertise X3

The category cannot be modified; it is determined by the chosen Order type.

Intercompany specificities:

For intersite orders automatically generated from a purchase order, products are always Received / Deliverablefields. In this case, the order category is always: Normalfields.

For intercompany products automatically generated from a purchase order, the sales order category is defined by the product of the first line entered on this purchase order:

If the first product is Received/ Deliverableor Not received / Not deliverable, the sales order category is Normalfields. The lines described below can include products:

of the Received/ Deliverablefolder. These product lines use the Delivery/Sales invoice flow.
of the Not received / Not deliverablefolder. These product lines are invoiced using the invoicing schedule.

If the first product is Not received / Deliverable, the sales order category is Direct invoicingfields. All lines are directly invoiced with no delivery.
You can only add products:

of the Not received / Deliverable,
of the Not received / Not deliverablefolder.