When at a gas station, i tried to enter gas prices, but LPG is cheaper and only has 3 digits (i.e. 0.759 EUR). When I entered 759, it accepted it as 7.590 EUR. The client should add leading zeroes, not trailing, as it resulted in a wrong price.
The second problem was that the software didn't accept the prices (it said they were invalid, luckily), but when I changed it, the client kept on saying the price was wrong. As a result, I gave up and drove off, without updating prices.
But the main idea is to have the software accept less digits, but always accept them as the LAST digits of the price, not the FIRST.