1. Create a teller (Teller A)with duration 01 April 2017 to 30 April 2017.
2. Create a cashier for the above teller, with same duration and check 'Full day'.
3. Create another teller(Teller B) with same duration ie. 01 April 2017 to 30 April 2017.
4. Create a same cashier for Teller B with same duration .
> The application is allowing to assign cashier to more than one teller having same duration which should not happen.