How to implement resend mechanism in BPM in order?

I have a requirement to implement a synchronous scenario in BPM,which doe sthe following steps
1)Recieves a transformed idoc message
2)Sends the message to a webservice synchronously
3)Waits for the response for a duration of 1 min
4)Resends it again if no response.
Could you please suggest a way to implement this processing in order in such a way that,if the idocs are sent in queued manner to the BPM,the second idoc is only sent after the complete processing of the first one is over,ie after the resend of the first idoc is completed?

Hi,
Does anyone have any suggestion regarding this.
For better clarity i will tell my requirement once gain.
I am implementing an idoc to synchronous web service scenario using BPM in between.The BPM have to recieve the idocs in order.This has been implemented successfully.
Now the BPM should accept each idoc,sent it to the synchronous web service,wait for the response and if no response available ,it should resend.If resend also not successful, then the other suceeding idocs should not be sent and should be stuck in queue,until we resolve the issue.Once the issue is solved,we should be able to resend the messages in the queue in the same order.
So al together,the entire processing should take place in Exactly Once in Order and the unprocessed idocs should be stuck in queue,if there is any sending or recieving issues.
I have currently implemented the BPM in such a way that i have a recieve step in loop with correltion as IDOC TYP so that it recievs all idocs to the same process instance.The same loop contains a transformation and also a sync send step with no exception handler defined to catch system sending errors.Hence the BPM will go into error status and the rest of the idocs will be stuck in the queue.And the BPM can be restarted after solving the communication issues. And all the messages will be resend.
If no sending errors,also,I suppose the synch send step willitself go into error state after it waits for the response for some seconds.Am i correct in this approach??
I would like to know your suggestions whether it will wrk fine or not.
Edited by: janice ann george on Jan 14, 2009 11:35 AM

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