You mean if they insert a new column into Transactions for example or rearrange the columns there, the INDIRECT keeps the formula from breaking because we can still find the appropriate column referenced? Just curious in case some less than expert comes across this and is curious 
P.S. thanks @cculber2 and @aronos for all the testing and bug finds here. Hopefully that will make our demo this afternoon more reliable and hope to see you on there if you can make it at 1PM we’ll give you a shout out