Capacity rk is the capacity for a resource r in the facility k, the amount of resource required per unit of material flow is ResourceRequirement .All quantities are for a particular time period and in a particular scenario.The third type of constraints ensures that flow in the supply chains is consistent with facility status and also specifies additional conditions on the configuration of the supply chain itself. An example of the first type is lower bound constraints on production of a product in a facility if any production of that product occurs. It should be noted that typically upper bounds are modeled using the capacity constraints described above. Examples of constraints on the configuration are limits on the number of facilities, either/or facility constraints which requires one out of a set of facilities to be established, or ordering of facilities which require one facility to be open before other facilities can be used. The general format of such constraints is as follows.rpk
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