Quantity below zero

A capacity, minimum quantity, requested quantity or quantity per output is below zero. A negative quantity has no meaning, so Network Optimization and Cost to Serve stop. Zero is allowed: a capacity of zero means closed.

What to do

Correct the sign on the rows the message names, in the data their Map node reads, or clear the value if the row has no such limit.

Where it comes from

Shown by Cost to Serve, Network Optimization. It is one of the messages about the scenario.