SWE - JAP - BEIJING - SWE "Same itinerary needed?"

Hi,

I'm planning to make the following trip:
- Fly with Scandinavian airlines from Stockholm to Tokyo.
- Fly with a different airline, say China Eastern, from Japan to Beijing
- Fly with Scandinavian airlines back home to Stockholm.

This will mean that I get the flights on two itineraries, one for SAS and one for China Eastern.

Question:
Is this a trip that qualify for the 144h twov? Or do I need to have all of the flights on the same itinerary?

Thanks in advance