Use of CommandValue to select discount multiplier

[stevew]

Thanks for the replies, but I am trying to avoid either asking a question or inputting a discount amount.

I have implemented a selective discount as per @emre guidelines

Checkbox for a product item to exclude it from "discount %" calculation

Hi @emre, Thank you for the suggestion. I think I understand the logic of your solution but do not know how to implement it. It seems you are suggesting: 0. If we don’t give any discount, we just print ticket. All prices are regular prices. If we give 10% discount (to qualified items only), we press a button that sets all qualified items to state = Discount At the same time, we update the ticket amount to apply the discount using {ORDER STATE TOTAL:Discount} To be frank I don’t understand h…

This works perfectly, except I have to enter 10 via the keypad to implement the 10% discount and simply press the button again to remove it (effectively entering a zero or null value I think). As we only ever have a 10% discount I initially modified the action to always enter 10, but this had the effect of not allowing the discount to be removed if the cashier made a mistake. I then figured I could use a [:CommandValue] expression with the CommandValue being toggled between 10 and 0 (as per screenshots above) but this has not worked as I expected.

I would prefer not to give the cashier the facility to choose a discount so would like to get this CommandValue idea working if possible.