Hi Ganesh
Like there can be a scenario of less than 100% awarding, a need may arise till the time of awarding for a increased quantity of the item you are sourcing hence the flexibility in the tool. So even if its not the best practice to award over 100%, it may solve intermittent/unexpected increase in the required quantity for which doing a new event might not be feasible. It may also be used as a sourcing strategy in some rare cases.
Cheers!!
Vilas