Custom BPM datasource in a BPM-BW integration

Hi BPM gurus,

I'm trying since a while to integrate BPM with BW.

I saw that standard datasources are available in our BW system, but I can't find custom datasources (the one I created to store business data) on BW side.

I only find this part of documentation, where SAP seems to say it is possible to do what I want:

https://help.sap.com/saphelp_nwce72/helpdata/en/60/794d3f1e5a4443b5f714b28f6f5fa1/content.htm

But I've not been able to find anything else.

Could you tell me if this integration is really possible, if the way of integrating custom DS is different?

Thank you very much!

Fred