Note you have referred to both TOTAL_EXPENSE and TOTAL_EXPENSES, you will need to use the right name.
It's green because it is set analysis, this is just how Sense formats set analysis.
If CLAIM_YEARMONTH is not actually a date field, rather it's a string or a number, then it will need to be treated differently.
If you create a Filter Pane with CLAIM_YEARMONTH, does it align to the right or the left?
You may be able to get the expression to work with the following:
Sum( {<CLAIM_YEARMONTH={">=$(=Max(CLAIM_YEARMONTH)-100)"}>} TOTAL_EXPENSES)
The best thing to do is to test and then build up, for example, does this work:
Sum( {<CLAIM_YEARMONTH={">=201703"}>} TOTAL_EXPENSES)
If so, we just need to get the date value to work correctly. Next create a text box and check the contents of the variable (the bit inside the $() ) to work, add the following as a measure:
=Max(CLAIM_YEARMONTH)-100
Check whether that returns the month you are expecting.
It will be far better to format the date properly on load (using Date and Date#) but treating the date as an integer should work.
Steve
