Model difficulty profiled

Where this network's difficulty for the optimizer comes from: open choices such as optional sites or minimum shipments, the level of detail, the size of its numbers, missing capacities and, after a solve, how close the plan is to the best possible. Nothing is wrong.

What to do

Nothing needs fixing. Where your business has already settled one of the open choices, say so: a contracted or ruled-out site, a real capacity or a range of sites you can operate makes the model truer and often much faster to solve.

Where it comes from

Shown by Network Optimization. It is one of the messages about a node.