I am trying to do the following expression in a query. Can someone help me to identify the problem and please explain the solution?
DAvg("[Exchange_Rate_Qry]![TO_Exchange_Rate]","[Exchange_Rate_Qry]","[Exchange_Rate_Qry]![TO_Number]='"& [Invoices_View_All]![Contract_Number] & '")
TO_Exchange_Rate is a number field. Everything else are strings.