How to display count of detail values for a dimension in WEBI ina separate column?

Hello Gurus,

I have a webi with State, City dimensions and Sales Metric. I have to display the City with Highest sales per each State.

I built this formula in the column next to State and City.

=Max(SALES) ForAll (CITY)

Which works good for me. But I see there are some Cells that have #MULTIVALUE error because in some cases there are 2 cities with both the same Highest Sales posted. ONLY in this case, I have to display both the Cities for the State dimension..in all other cases i have to display only one CITY with Highest Sales in that STATE. Would appreciate any support in this.

NOTE:      This is a WEBI built on top of a BEX query Via BICS connection and no Universe layer in between.

                 Version: BOBJ 4.0 SP8

Thanks,

RCC