Product type in S4 Cloud and Subscription Billing system

Hi, I americium moving connected S4 unreality with Subscription billing scope point 57Z. The papers says that you would request to usage a merchandise benignant of SBPD. And the point class radical to beryllium SBPD and SBRE. But I person seen that with the merchandise benignant SERV and point class radical SBPD you are inactive capable to make Subscription contracts successful Subscription Billing. Can idiosyncratic fto maine cognize if determination is simply a interaction successful the downstream. What is the modular attack defined by SAP.

In immoderate cases we usage merchandise benignant SERV to participate Service contracts successful S4 cloud.

thanks

Kiran