Accrued Revenue

You sold guns to Somalian warlords. You figured the cash you earned would literally pay for your sins in Hell. The warlords haven't yet paid you for those guns. They've promised to, uh..."raise" the dough at sea as soon as tourist season comes along.

The revenue that you're owed from the sales of those guns to the warlords is an accrued revenue––you have not yet billed them for the money, in part because you felt this was just rude, and with all the guns you've sold them, you really don't want to upset them.

The contract was signed, the revenues have been deemed to have been earned, and everything is final. You have great confidence that they will, in fact, pay after tourist season passes, and plan to bill them net thirty when that blessed time comes along. You muse the opening of the bill as "please allow me to introduce myself..."