IDOC with MM ??

Hi
Can some body explain me about the IDOC flow with MM .
What is IDOC ??
Why its used with SAP??
What its advantage ??
In simple way some body can explain me
Thanks

HI,
1) What is IDOC?
          IDoc means intermediate document is a standard data structure for electronic data interchange (EDI) between application programs written for the popular SAP business system or between an SAP application and an external program. IDocs serve as the vehicle for data transfer in SAP's Application Link Enabling (ALE) system.
2) Why its is used with SAP?
         IDocs are used for asynchronous transactions: each IDoc generated exists as a self-contained text file that can then be transmitted to the requesting workstation without connecting to the central database. Another SAP mechanism, the Business Application Programming Interface (BAPI) is used for synchronous transactions.
3) What its advantages & disadvantages?
   a) IDOC - Advantages :
The target system need not be always online. The IDOC would be created and would send the IDOC once the target
              system is available.
No additional programming required. Configuration is the only one need to be set up.
   b) IDOC - Disadvantages :
Receipt/Processing on the target system need not be immediate
When no standard IDOC is available, then it is very hard to create a custom IDOC when compared to creating a
                standard BAPI
Unless ALE is used, it is difficult to trace if the IDOC has actually reached the target system
4) IDOC flow with MM :
         In order to make use of the workflow for IDoc processing, you do not have to go through the cumbersome
         workflow design procedure as it is described in the workflow documentation. For the mentioned purpose, you can
        register the workflow handler from the menu, which says Event Coupling from the BALD transaction.
        Triggering the IDoc from a workflow event has a disadvantage: if the IDoc has to be repeated for some reason, the
        event cannot be repeated easily. This is due to the nature of a workflow event, which is triggered usually from a
        precedent action.
Hope, it is useful for you.
Regards,
K.Rajendran

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