OLAP Pivottable calculated column (mdx calculated measure?)

[MrsAlice]

Hello everyone,

Below is a simplification of a pivvottable (OLAP!) I've created. I'm having trouble adding a column that shows the difference between the two periods

• I cannot use a calculated column because the source is OLAP/cube
• I cannot figure out how to use an MDX measure because there is only 1 value field (I can make this work for YTD & LYTD (year to date) because they have their own fields in the cube. MDX measure in that document is simply "[YTD] - [LYTD]").
• It needs to auto populate. It cannot become a manual task with regular formulas.
• Only 2017 and 2018 are showing because of a slicer.

Can anyone point me in the right direction?

Thank you.