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Hi, In my problem I have a node network, where nodes have different roles. Some nodes can only open like plant, some node can only open like supplier type A , some node can only open like supplier type B and some node can open like plant or supplier. I create a set with all node set n nodes /n1*n10/...

Hi all, many many thanks in advance for any help you can provide with the following issue: I have a supply chain network design problem, where all the nodes can be open like plant or like supplier. I make that: SETS n nodos /n1*n10/ ni(n) plants // nj(n) suppliers // variable CT COST Y(nj) binary va...