Show only dates in chart which are a Friday when Date selected

[alan_grn]

I am trying to create a chart that will only shwo the dates which are Firdays when a specific date is selected.

I have started with

SUM({$<[BUSINESS_DATE]={$(= WeekDay ( BUSINESS_DATE)=4 &'<='&DATE((MAX(BUSINESS_DATE)))&'"')}>} [CREDIT_BALANCE])

It does not return any data

Thanks

Alan