The latest SourceBoost version (v7.05) doesn't support the PIC12F683 in MPLabX.
I followed all the instructions in the MPLabX_Plugin.pdf.
The PIC16x processors are supported but none of the PIC12 processors are. Looks like it needs a metadata change inside of com-sourceboost.jar which is buried inside of the SourceBoost config file for MPlab but I didn't want to go there.
I'd be happy to beta test a fix for this...