My inherited Olivetti ECR7100 refuses to input anything other than whole numbers when entering prices for a sale! It's been since I reset the cash register. Help! It's very embarrassing in front of customers!! For example, I can enter £12.00, but not £12.50, or any other part of £1. I get an E1 error. I have checked that my decimal point setting is set to two decimal places... don't know what else to check!