Conditional Formatting based on 2 different columns in cube view

A workaround in CV could be to create a third column, with its value calculated from the first two. You can do that calculation with an XFBR or with a GetDataCell custom function. I'll show the latter, because it's a bit less common and equally useful (note this code is not well-tested, I'm showing the principle). In the member expansion you'd have:

GetDataCell(BR#[BRName=MyFinanceBR, FunctionName=MyCustomCheck, FirstCriteria=CVC(Col1), SecondCriteria=CVC(Col2)]):Name(Pass Or Fail)

You'd then need a Finance Business Rule that implements that function:

' in MyFinanceBR
Case Is = FinanceFunctionType.DataCell
	If args.DataCellArgs.FunctionName.XFEqualsIgnoreCase("MyCustomCheck") Then
		If args.DataCellArgs.NameValuePairs("FirstCriteria") > 200000 _
				And args.DataCellArgs.NameValuePairs("SecondCriteria") > 0.20 Then
			Return 1
		Else 
			Return 0
		End If
	End If

At that point you can have conditional formatting on the cell that works with the returned value:

If (CellAmount = 1) Then
     BackgroundColor = Red
end if