MM Service PO created as a regular (material) order in SUS

Dear experts,

We are on SRM 7 and ECC 6 EhP 4 and we have set up the MM-SUS scenario.

What do I need to configure in order to get a service order in SUS?

I have created a simple service PO in MM (Item Type D).

After replication to SUS it is coming in as a regular SUS order and not as a service order.

The system is expecting these follow on documents:

- Purchase Order Response

- Shipping Notification

- Invoice

I was expecting a confirmation as following document in order to create a SES. But that is not the case.

Am I missing something?

Thanks for your help