Supply has no use

A supply policy row supplies a product that no lane carries, no demand asks for and no recipe uses, so it could never be used. The run stops. This is usually a product named differently here than on the lanes or demand.

What to do

Correct the product on the rows the message names to the one the lanes and demand use, add a lane that carries it, or remove the rows.

Where it comes from

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