mPOS screen layout Sale button error

I'm sure we all run into this issue before so I want to make a post about it. When we are configuring the button on mPOS especially for "Product sale" it required us to enter a Bar code. So we would then go ahead and select a bar code from the list, and DONE! When we open up mPOS and click the "Sale" button we quickly realized that it just sold the product from the bar code that we have selected earlier when we were configuring the button properties. However, it should take us to the sales screen should it not? So I found out that instead of selecting a bar code you can add  S P A C E S  in the bar code selection of the button configuration and it should bypass the error where it required you to enter a bar code. Next time you open mPOS and click the "Sale" button it should take you to the sale screen. Not sure why Microsoft code the logic to work like that  ¯\_(ツ)_/¯ I guess it was like an easter egg you find on your own.