Corrected deliveries cannot be changed

What causes this issue?

The delivery entered is a corrected delivery for the reconciliation
of the cumulative quantity in a
<DS:GLOS.scheduling_agreement>scheduling agreement</>. It cannot be
changed directly.

How to fix this error?

You can only display the delivery.
For the further reconciliation you can enter more corrected deliveries
while processing the scheduling agreement.

Error message extract from SAP system. Copyright SAP SE.