I tried both suggestions but no luck. Below is the SQL
SELECT qryDrwgRegister.tblDrwgRegister.DwgID, qryDrwgRegister.ContractName, qryDrwgRegister.IssuedBy, qryDrwgRegister.DwgNo, qryDrwgRegister.DwgTitle, qryDrwgRegister.tblDrwgRegisterDtls.DwgID, Max(qryDrwgRegister.Rev) AS MaxOfRev...