While an invoice is approved and before the payment is due, the maturity date can be changed by the buyer. The maturity date of an Invoice can never be set to a date in the past.
Note
The maturity date of an invoice is the date the invoice will be paid. An invoice maturity date is calculated when the invoice is APPROVED and must be a working day in the program calendar.
Contact your buyer directly if you need to change an invoice maturity date.