Automatic check of invoice number to prevent duplicate payment Merged

When you enter an invoice numbera tick is high lighted (highlit?) asking if you want to check if this invoice has already been paid. Well of course you do, but you have to click on the tick - it would be so much easier if the system did an automatic search - it can be done - the software we used before SAGE had it - and I miss it. Also, itstime consuming to get logged into this site - it would be so much easier if the guys on the phone logged any goodideas.