Use this field to define the storage site (warehouse) at which Material Requirements Planning is required.
A storage site has the check box Stock (Details section) selected.
You can run MRP for multiple sites. The position of a site in the selection table is important. In effect, MRP processes the sites successively, that is if the selection order is site A, then site B, then site C the calculation will be performed first for site A, then for site B, then for site C. The processing order can be important if MRP calculations generate intersite suggestions.