High priority and low Severity defects

Suppose in one banking application there is one module ATM Facility. in that ATM facility when ever we are dipositing/withdrawing money it is not showing any conformation message but actually at the back end it is happening properly with out any mistake means only missing of message . in this case as it is happenig properly so there is nothing wrong with the application but as end user is not getting any conformation message so he/she will be confuse for this.

So we can consider this issue as HIGH Priority but LOW Severity defects..