Hi,
The intercompany picking list will be available on the intercompany purchase order, to generate the picking lists of the IC orders
Assume you have:
Company A, which is your producing company. Here you will have the IC Sales order.
Company B, which is you end customer selling company. Here you will have the IC Purchase order and normal Sales order for the end customer.
The button should be available for you on the IC purchase order in Company B, but if I remember correctly it is not available in case of direct delivery.
BR
Nikolaj