Delete status set for physical inventory document &

What causes this issue?

You have deleted the physical inventory document. Since inventory
differences have already been posted for at least one item, the system
cannot physically delete the document, because it serves as proof of
the physical inventory.

System Response

The system has set the deletion status in the document header to
<LB>X</>. You can no longer change the document. It can only be
archived.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.