hi
just use the char 0CALWEEK restriction on revenue and create a formula (F1) then copy same formula and create a new one (F2) - use offset -1 to get previous week revenue.
And by using a simple calculation to get the F1-F2 (revenue) value.
just hide F1, F2 if you don't want to display.
No need to use the Replacement Path.
Thank-You.
Regards,
VB