While passing entry,following things should be taken care of
- Totaling of bill (Some vendors do cheating while totalling)
- Vat No if vat) charged on bill, same for service tax and excise
- If tds deductible, pan no available,if no pan no 20% tds
- Maintain Cost Centre
- Maintain Bill Details(New Ref/Agst Ref)
- Due date of payment
Also it should be ensured that it is not a duplicate bill by checking old entries of Party in Tally