Background

Symphony Profiler Processor shows that the reservation is "In use by another application".   This means that the scanned document is open somewhere else on your network.  

Resolution

The must likely culprit is the scanning software itself (if you are using a desktop scanner).   Check to ensure that the file isn't left open in your scanning software.   If so, close it.   If not, ask your IT administrator to check your server's 'open files' list for the problem document, and see which user has it open and ensure that they close it.