An entry with this key is marked for deletion

What causes this issue?

When creating an entry, you specified a key which was already assigned
and is currently marked for deletion.

System Response

The new entry cannot be created.

How to fix this error?

You can:
enter another key
delete the entries before entering the new entry
The entries flagged for deletion can then no longer be reactivated.
End the error dialog with <LS>Cancel</>. Choose <LS>Save</> and repeat
your new entry.
reactivate the entry marked for deletion to change it :
and return to the overview screen with <LS>Back</>.
Choose <LS>Display deleted entries</> in menu <LS>Select</> to select
all the deleted entries.
Mark the entries that you want to reactivate.
Choose <LS>Retrieve</>.

Error message extract from SAP system. Copyright SAP SE.