I'm currently building a Query which will be used to produce Invoices in the form of a report. The query has 4 fields: Client, CoveredJan, CoveredFeb, CoveredMar, and Fee. Following these fields is an expression, TotalBill =([CoveredJan]*[Fee])+([CoveredFeb]*[Fee])+([CoveredMar]*[Fee])
My only...