My requirement is to display SALES or PURCHASES type on the top of every page.
However, if there is a change mid-way into the page, I want to display the new value.
I guess it's something like, "if this transaction type isn't like the one before, display the new transaction type".
Of course, if the last transaction on page one doesn't match the first transaction on page 2, i don't want display the conditional type.
Implication is, the formula also has to consider what happened on the page prior.
Suggestions?
And thank you for reading ! 
