BSD Lock?

So I have a rule that is failing because of this message in the log:
Why won't Hazel process the file? Also what is a BSD advisory lock? FYI the directory I am processing on Hazel is on my Synology NAS which I have mounted as SMB.
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Hazel.log:2015-03-16 18:44:56.505 hazelworker[76442] DEBUG: Found BSD advisory lock for file: /Volumes/Scotts Stuff/Shared/Complete/Interstellar.2014.IMAX.1080p.Bluray.x264.DTS-EVO/Interstellar.2014.IMAX.1080p.Bluray.x264.DTS-EVO.mkv
Hazel.log:2015-03-16 18:44:56.505 hazelworker[76442] File Interstellar.2014.IMAX.1080p.Bluray.x264.DTS-EVO.mkv is busy. Skipping for now.
Why won't Hazel process the file? Also what is a BSD advisory lock? FYI the directory I am processing on Hazel is on my Synology NAS which I have mounted as SMB.