Plain Total null if there is no tax

I’m experiencing some unexpected behavior. I’m trying to apply a discount to the subtotal of a ticket, however if the item has no tax PLAIN TOTAL is null. Do I need to check for null plain sum or is there something that always provides a sub total regardless if tax exists or not?

Try {PLAIN TOTAL: } see if it works for you.

Yep, that worked. What does the semi-colon and the space indicate/mean?

It does exactly what you wanted. It was added for that reason.