BootCamp, can't partition SSD
This Mac Book Retina was originally delivered with Mountain Lion. The upgrade history contains Mavericks, several Yosemite DPs and finally the Yosemite GM Candidate.

One of the Yosemite Developer Previews transformed the previous Apple_HFS partition into a Logical Volume Group.

The (only) Logical Volume is not revertible:



The Boot Camp assistant can't modify the partition map and shrink such a LVG to free up some unallocated space for a Windows installation on a hard disk.

The only possibility (we found) to solve the problem is a complete reinstall:


Backup all your data
Disconnect all external hard drives
Restart into Internet Recovery Mode by pressing altcmdR
(alternatively you may use a Mavericks or Mountain Lion Install Thumb Drive)
start Terminal from the menubar/utilities
enter following command at the Terminal prompt: 


  diskutil cs list

Copy the Logical Volume Group (LVG) alphanumeric UUID of your CoreStorage volume. The LVG UUID should be the first listed. In the above example the alphanumeric is:
312C0A5B-AC3E-4008-895F-6EDFDD386825.
Run the following command:  


  diskutil cs delete UUID  


According to the number found above it would be:  


  diskutil cs delete 312C0A5B-AC3E-4008-895F-6EDFDD386825  


This will delete your CoreStorage volume and your Recovery HD and reformat it as a simple HFS+ volume.  
Quit Terminal
In the now opening window choose Disk Utility and format/partition/rename the internal drive. Choose 1 Partition, Mac OS Extended (Journaled) and GUID partition table (available with the option button). Quit Disk Utility.
Now choose 'Reinstall Mac OS X'
The originally shipped OS X will be downloaded and installed
Set up your Mac
Download and install Mavericks from the App Store
Start Boot Camp Assistant, repartiton your Mac and install Windows
Download and install Yosemite from the App Store


At step 10 one may boot alternatively to a Mavericks or Mountain Lion Install Thumb Drive if available and install the respective OS X.

Starting into Recovery Mode at step 3 doesn't help because it's impossible to delete the LGV then.