A PC first seen before the machine-number fix was created with the machine
number as its OWN asset number, and the fix deliberately does not overwrite an
existing PC's asset number. So resolving the reported number can return the
reporting PC itself, and the marker was then filed partof its own PC - which
reads, on the machine page, as the PC being the operation.
The machine-link path already guarded this case; the marker path did not. It
now refuses and says why, naming the repair: rename the PC asset to its
hostname, or create the operation asset.
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