if(
  
          isnull(local!monthofrelease),
          {},
          a!queryFilter(
            field:"MonthofRelease",
            operator:choose(local!monthofrelease,"=","=","=","=","=","=","=","=","=","=","=","="),
            value:choose(local!monthofrelease,1,2,3,4,5,6,7,8,9,10,11,12)
          )),