I have a Bootcamp partition on my Imac with Mavericks which I can't delete because the Partition Layout is greyed out and is stuck on 'Current'. What can I do?

Question

I have a Bootcamp partition on my Imac with Mavericks which I can't delete because the Partition Layout in Disk Utility is greyed out and is stuck on 'Current'. What can I do? I was trying to install Windows 8.1 but apparently, this is not yet possible.
I was originally able to restore to my original Mac OSX partition using Boot Camp Assistant but then after entering Disk Utility and re-RAIDing the default RAID 1 to RAID 0 in the BootCamp partition (I suspect this is the cause of the problem but why was it defaulted to RAID 1 in the first place?!!!!), forever afterwards, I couldn't restore the single OSX partition.
Whenever I used BootCamp Assistant my choice to 'Install or remove Windows 7 or later version' was greyed out. Finally I went to Disk Utility to repartition but the Macintosh HD and BootCamp disk partition functions were also greyed out (even if I started up from Recovery mode holding down option, command and 'R' and choosing Disk Utility). BootCamp Assistant gives the error message 'The startup disk cannot be partitioned or restored to a single partition' with additional small script 'The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows', and DU gives the error message 'The full size of the Fusion drive is not available for repartitioning'.
What can I do to fix this problem? How can I make the Partition Layout button active in DU so I can change the partition to all OSX? I'm prepared to wipe off all my data etc to repartition and have backed up all to disk using Time Machine.

Answer 1

My problem is fixed now, thank you. It was caused by my changing the Boot Camp partition's 'RAID1' to 'RAID0'. If I hadn't done that, Boot Camp would still have been able to 'restore' back to the one partition. It was fixed with the help of Applecare by using a terminal and typing a command to erase the IP of the Macintosh disk (not the volume) as well as the IP of the Bootcamp partition (if I remember correctly), but then I had to restore the OS and all my applications and data etc which I had previously backed up using Time Machine. I haven't taken note of the exact command terminology used. It would be wise to speak to Applecare about this if possible.
Two words of warning, 1. According to the cause of this problem, it might be wise, after reinstalling the ops system to reinstall all extra applications one by one, manually, in case a similar problem arises again. Then manually copy back all data. Or the Mac user could use the Time Machine backup and then uninstall all the added apps then re-install them one by one manually. 2. Beware as after all this the user might not have the 'Recovery partition'. There is a small recovery partition (a few 100 Mb is size) which comes with all later Macs. After all this is done this tiny partition might not be there anymore and the user might have to re-install Mavericks again to get it back, or just install the upcoming update of Mavericks due in a month or so.