conditional formatting in pivot table

I have rows of data that look like this example in my pivot table:

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I want a conditional format rule that highlights each month where the amount is different than the prior month. For this example, I would expect Jun, Aug, and Sep to be highlighted. Can I accomplish this in a pivot table and if so how exactly?

The following works for the sample of data provided.
The following formula in applied to All cells showing "sum of value" values for "ref" and "date": =AND(E6<>F6,LEFT(E$5,1)+0=1)
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