Can a BPEL process wait for a second web service call

Hi,
My BPEL process is an asynchronous process, so the first web service call kicks off an instance of the process.
what i want is somewhere down in the process i can put a "receive" shape to pause the process and wait for another web service call to come in, once the "receive" shape gets the second web service call, the process continues on.
Is that a valid thing to do on BPEL?
i don't seem to be able to get it working.
i could change the WSDL for the BPEL process to publish two operations, the default "initiate" and another one called "continue", they both accept the same type of request message.
but when i test it, the BPEL process just can't accept message at the second operation, it always creates a new instance to handle the web service calls, even when the call is targeting "continue" operation.
Any ideas?
Thanks in advance!

I was just about to give up after the last post but then the "pick" shape hit my eye somehow ("thank God", that's all i can say)
and it did the trick, the "pick" shape can wait for an incoming call from a partner link.
so what i can achieve is this,
the first web service call sends some thing like
<Root><CorrelationId>1</CorrelationId><Content>first name</Content></Root>
on the "initiate" operation, just like calling an "initiate" method in java code
the BPEL instance gets initiated, reaches the "pick" shape and stops
then a second web service call comes in as
<Root><CorrelationId>1</CorrelationId><Content>last name</Content></Root>
on the "continue" operation, again just like calling a "continue" method
it works!

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