The dates for at least one order are not current

What causes this issue?

In at least one of the orders for which you have called up the
availability check the dates are not current.

System Response

The availability check can be carried out but the results are
calculated depending on the old dates and therefore in some
circumstances do not correspond to the expected results.
If you still want to carry out the current check and the automatic
availability check is active for when the order is saved then the check
is not called up again when the order is saved.

How to fix this error?

Reschedule the order(s) affected and call up the availability check
again. You can recognize the orders whose dates are not current by
their system status: NTUP (dates not updated).

Error message extract from SAP system. Copyright SAP SE.