Dynamic splitting of messages

All,
We have a file input which has around 500K records. These records needs to be translated against a legacy system. The legacy system tells how many records it can accept in a single call during the handshake call and it varies from time to time.
Is there way to split the original message with 500K records into different messages with "x" records / message. x - is the number we got from the legacy system during the handshake.
How can we do this dynamic mapping?
Thanks.

Hi
Pls go thrugh the links below
http://help.sap.com/saphelp_nw04/helpdata/en/ce/bb2c421f3fda2ce10000000a1550b0/frameset.htm
You can do this using multi-mapping and BPM. Please have a look at this:
http://help.sap.com/saphelp_nw04/helpdata/en/21/6faf35c2d74295a3cb97f6f3ccf43c/content.htm
/people/jin.shin/blog/2006/02/07/multi-mapping-without-bpm--yes-it146s-possible
/people/sameer.shadab/blog/2005/09/23/an-interesting-usage-of-variable-substitution-in-xi
/people/sudharshan.aravamudan/blog/2005/12/01/illustration-of-multi-mapping-and-message-split-using-bpm-in-sap-exchange-infrastructure
Use node function SPLIT BY VALUE.
This link has the descrption of the same,
http://help.sap.com/saphelp_nw04/helpdata/en/21/3bb8c495125e4eb5969f0377885fe0/content.htm
Also, it is possible to create N messages without BPM. Check this blog for this,
/people/jin.shin/blog/2006/02/07/multi-mapping-without-bpm--yes-it146s-possible
/people/sravya.talanki2/blog/2005/12/08/message-mapping-simplified-150-part-ii
pls reward if helpful

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