How do we let vendors know the orders should arrive between a specific time frame?

When you are in line detail and after you put in your description click on the button called additional vendor notes (right under the description) and place the statement “All merchandise for the 2016/2017 school year must be received by June 14, 2017. If merchandise is not received by June 30, 2017, the Purchase Order will be canceled and returned to the originator”.