Currency not stated

Rows carry money, such as costs or revenue, but the scenario does not say what currency it is in. The currency is never taken from the rows or assumed, so the scenario is not saved.

What to do

Set Currency on the Create Scenario node, for example EUR. For an imported scenario, export it again from a run whose Create Scenario states its Currency.

Where it comes from

Shown by Create Scenario. It is one of the messages about the scenario.