RE: X++ Count Distinct CustAccount

I don't understand. Do you mean to use it like this?

while Select count(InvoiceAccount) from CustInvoiceJour

    join DriverShipTableDet where driverShipTableDet.InvoiceNo == this.InvoiceId

     join driverShipTable group by driverShipTable.SeqNo

   where drivershipTable.SeqNo == driverShipTableDet.SeqNo

   {

   return str2Int(this.InvoiceAccount);  

   }

This throws "Method  never returns a value."

Thank You