TypeError: unsupported operand type(s) for -: 'Decimal' and 'Decimal'. Why?

[Zentrader]

> In the utter absence of any clues from the OP, Marc was demonstrating
> one possible way that the puzzling [Can't subtract one Decimal
> instance from another???] error message could have been caused.

Ah yes.  Until this is no longer true, "In the utter absence of any
clues from the OP", we can do no more.  My appologies to Marc for
misinterpretation.