Sample calculation can't be reset because material sample &1 is locked

What causes this issue?

If you execute the function <LS>Cancel sample calculation</>, this
affects all material samples of the inspection lot; they then receive
the status <LS>deletion flag active</>.
Sample &V1& is currently being processed by user &V2& and is
therefore blocked.

System Response

Because of this blocked sample, you cannot cancel the sample
calculation.

How to fix this error?

Wait until the block has been lifted, and call the function again.

Error message extract from SAP system. Copyright SAP SE.