When a cycle count is processed on a location, this location is locked by the system for that user.
That way, there are no other processes that can adjust the stock on this location, as long as we are still processing the cycle count.
Probably the user (SCANNER 1 in this case) has selected the location to do a cycle count, but he did not process this count.
(So he went back out of the cycle count flow or closed the Produmex application)