Document &1 deleted; not yet released

What causes this issue?

Print document &v1& was deleted.
Print document &v1& was created by invoicing, but was recognized as
being invalid and was outsorted due to the outsorting check that was
set. This also means that no FI-CA document was created that would have
to be reversed.
Therefore, it is sufficient to delete the print document &v1& that is
to be reversed.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

You can invoice the contract account again.

Error message extract from SAP system. Copyright SAP SE.