Netweaver BPM - how to achieve collecting messages and send as a single

Hi Experts,

Anybody could please suggest me the steps in NW BPM (not CCBPM) for collecting multiple messages (of different service interfaces) and send as a single message.

I have designed as below:

In start event given dummy interface as trigger and after start, created 3 automated activities with 3 intermediate events and given 3 correlations(as I am collecting 3 messages), and given my 3 Interfaces in 3 automated activities.

Is it the correct approach.

Please suggest.

Thanks,

SPMD