Multi Site but run MRP PO suggestion has problem

Hi there, We have two factories at two cities, To split the cost between the two plants,we set two sites.
But here comes problem: we will only purchase material at A site, and transfer material to B site when B site have job. Because some material can not split(like wire), so B site will have remain stock. Then when we run MRP and create PO Suggestion at A site, the remain stock at B site and the SO demand at B Site will not be consider. That will lead a wrong PO Suggestion and will over-purchasing.
So from financial perspective: we need split cost of two sites(that no problem)
from purchase perspective: we need consider the both sites demands, stock together when we run MRP and create PO Suggestion.
Any suggestion? What should I do?

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You will have to adjust min quantities at each site and set the part to be purchased at site A and a transfer part (from Site A) at site B. That way MRP should plan transfer orders for site B and purchase order suggestions for Site A.

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