ParforEach Mode in Block Step in BPM

Hi All,
We designed a BPM with a block step in Parforeach mode.
For this block step, a multiline container is the Input.It has all the messages to be processed in parallel. But during runtime this block step is not processed in parallel mode.The messages are processed one after the other in sequential mode.Only different instances of the block step are generated but they are processed sequentially.
Any suggestions!!!
Regards,
Srinivas.

Hello,
You could read here:
http://help.sap.com/saphelp_nw04s/helpdata/en/ce/bb2c421f3fda2ce10000000a1550b0/frameset.htm
that:
A ParForEach is not a means of improving performance. A ParForEach will not result in a split into threads.
Could this be the reason?
Regards
Patrick

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