EPM Formatting sheet -formatting last 2 months

Hi

We have 12 months actuals and 12 month plans in columns.  I have requirement to formatting last 2 months of Actuals (Column)in different colour in Rolling forecasting template, so formatting should be applied dynamically. Cant create additional properties in masterdata, so thinking of conditional formatting, some thing like G=2=PLAN apply  conditional formatting to column E and F but its not working.

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Could please suggest the simplest way to do this ?

Thanks

Jack