Try to read the SAP documentation and later ask to the forum if you have any doubt with a specif function and/or example. You would consider to research a bit before to ask because the question is so generic.
Did you try to search on SDN before asking the question ? There is plenty of matter available. Hava a look at one of them /people/sravya.talanki2/blog/2005/12/08/message-mapping-simplified-150-part-ii .
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