Integration between an external system and SAP OM

Hi everybody,
I need to integrate an external system with SAP OM, and I would like to know how to do it (idoc? BAPI? other?)
What we need is the following:
1. External system -
> extraction of data changes (Cost center, positions, jobs changes) to an excel file
2. Excel validated by HR administrator
3. Validation of this file -
> creates an Idoc (how do you create it?)
4. This Idoc feeds SAP OM
Regards, and thanks in advance for your answer.
Angie

Hi Pradeep,
Thanks for your answer!
I am fresh in this area of SAP, and I still have questions...
What are the BAPI and Objects to use in this case? (I can't find any for OM)
Thanks again for your enlightenment.
Angie

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[0FI_AR_4 |http://www.file-upload.net/view-1447743/0FI_AR_4.jpg.html ]
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Integration between an external system and SAP OM

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