It does work. I use it all the time on my 300.
Is the name of your column really #genre? What do you see when you hover your mouse over the column heading? You should see 'The lookup/search name is "#genre"'. Check the spelling carefully. It must exactly match what you are putting in the series box.
What have you set "metadata management" to? That configuration item is in preferences -> sending books to device. If you are letting calibre manage collections (you are *not* manually creating them), then automatic is generally best for Sonys.
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