how is lack of standard of deferred payment a drawback of barter system?

deffered means delay .....in barter system if we take something like shoes in exchange of wheat to be paid in future .then the person may refuse to take wheat at previous quantity because change in quality or change in value...

thank you....

If we take shoes in exchange of fruit then the value of fruit become cheapest or uneatable because fruit become decay or destroyed.so deferred payment is not possible in barter system

It is related to future payment.suppose we take something like apple in exchange of Egg then the value of apple during the intervening day become decay or decompose.so in absence of money deferred payment was not possible in barter system.