The delivery schedule date lies in the future.

What causes this issue?

You entered a delivery schedule date which lies in the future.
If the delivery schedule date is not within the current fiscal year of
the customer, the system assumes that the deliveries of this fiscal year
are not to be considered for the calculation of the open delivery
quantity.
Exception: When the cumulative received quantity is appropriate for the
current year, the cumulative delivered quantity of the current and the
following year are added.

How to fix this error?

Check the delivery schedule date.

Error message extract from SAP system. Copyright SAP SE.