Getting a Deferred Expense to Amortize

I have a deferred expense invoice that is due for amortization; however, when I attempted to amortize the expense in the Amortize Expense function, the message “No expense has been amortized.” is displayed. Why?

This may happen if the amortization method is Specific. You must first confirm the amortization schedule in the Schedule Expense Amortization function before you amortize the expense. Accept or amend the Start Date and Post Date in the second Schedule Expense Amortization window; then, click, the Save button. Amortize the expense using the Amortize Expense function and be sure to enter the correct Post Date as confirmed in the Schedule Expense Amortization function.