What does the "nearby" trait do in the manager job conditions?
It should be in a stockpile, or 20 tiles of the initial position. 20 tiles from the workshop for example.
I think you should be able to access it too, if it have no way to access the stockpile or workshop it will not be available as nearby.
Edit: I was trying to find a source, and remember to see it in the wiki http://dwarffortresswiki.org but the best thing I found is:
- http://dwarffortresswiki.org/index.php/DF2014:Butcher#Troubleshooting
Hope this helps.