Paying customers with something missing — no plan, a connection that cannot publish, or nothing queued ahead. A customer who has met quota is owed nothing and would be invisible in a due list while still receiving nothing, which is what this catches.

Everything scheduled but not yet published. This is what the other side has put in — an empty list with customers under contract means nothing is coming.

A plan is what makes a customer count as owed anything. Set one here for any customer, not only the ones already showing a gap.