MRP across multiple plants

Hello everyone,
I have a scenario where I have multiple plants. During Production of some finished products, I have to procure some material from anothere plant. For this I have used Special procurement key in MRP 2 to throw requirement to corresponding plant.
As Per MRP run, I Hope to use NEUPL run once a week for the corresponding plant. Do I Have to run MRP seperately for each plant so that MRP requirement for semi finished products are also raised in corresponding plant. Will in that case help to group together multiple plants under scope of planning or an MRP area.
My second question is that if we run MRP with processing Key: NETCH what can be the corresponding impact. I was hoping to run it daily so as to capture changes in requirements, if any.
Please do give your suggestions.
Sincerely,
Aji Kurian Mani

Brian,
I am looking for a way to run MRP across multiple plants as if it was one plant.
Well, that phrase can mean different things to different people.  In general, though, SAP ERP does not support this requirement.
I guess you overlooked the rules of engagement for this forum, which state that you should first search the forums for answers before posting a question.  There are lots of workarounds, using Special Procurement and/or MRP Areas.  Just search the ERP PP and ERP MM forums.  This topic has been discussed extensively.  
There are also several third party products available that can probably meet your requirements as well. Be advised that the purchase price of these products are substantial, and the implementations are not trivial.  Many shops are unwilling to invest the money and effort into advanced planning systems, and end up just working with ERP planning, using workarounds, enhancements, and  business process changes.
SAP is also marketing one of these advanced planning products as a 'solution extension', that they are calling Supply Chain Response Management (SCRM).  This software was developed by the third party software company ICON, and SAP now has established a relationship with ICON. You can see info on the software at
http://www.sap.com/solutions/solutionextensions/supply-chain-response-management/index.epx
and also on the ICON website at
http://www.icon-scm.com/en/products/sap-supply-chain-response-management-by-icon-scm/
Best Regards,
DB49

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