What is the use and functionality of a message type

Hi,
I am new to abap. Can anybody tell me what is the use of the message type? What is it used for?
There is an interface which is using an extended idoc type ZFIDCCP02 (Basic Type FIDCCP02). This extended idoc type is used for other interfaces and the interface in question. However the other interfaces are using the standard message type FIDCC2, but the interface in question is using a customized message type.
Any idea what could be the reason?
Thanks in advance.
Mick

Hi Mick,
Message type tells the about the actual meaning of Idoc..
later if you want to send data to external system the idoc type or extension type is not used..
the message type is used for rest of the process..
Idoc type is know as structure..
<< Cut and paste without attribution from http://www.*******************/2009_01_01_archive.html removed >>
<< Cut and paste without attribution from http://searchsap.techtarget.com/sDefinition/0,,sid21_gci852485,00.html removed >>
<< Points unassigned >>.
Regards,
Prabhudas
Edited by: Prabhu Das on May 14, 2009 8:38 PM
Edited by: Rob Burbank on May 25, 2009 4:30 PM

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