Location not on any lane

A supply or demand location is not the source or target of any lane, so its supply cannot be shipped or its demand cannot be reached. This is a warning: the solve still runs, and the row plays no part in the plan.

What to do

Add a lane from or to the location in the data Map Lanes reads. If the location is not part of this network, remove its supply or demand row.

Where it comes from

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