>>There is logic to accounting - just no math. Or, rather, it's fake math. And then you get into the logic of Government Accounting, which is even more.....everything.
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>One thing I learned from accountants here that any cancellation has to be posted as an identical amount of money, going the same way as the item being cancelled, only with the amount being negative. If you posted a payment of 234€ by a wrong payor, you post the cancellation - i.e. the same guy paid -234€, and then put another post saying that the right guy paid +234€. Same with canceling invoices.
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>Then I got into the US and got wrongly billed several times. Of course, each time I called to complain, and they said they will... not cancel the invoice. They will credit my account(!). Huh? It would look as if I paid it, which I didn't, actually I refused to pay. Besides, there would be no record of my payment anywhere. They were just inventing money.
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>I'd bet an american beer that they would be able to explain the logic of this, if proper coercion was applied.

Depends on the American beer you want to bet. (grin)