Quick question: How do I clear the name of the CAPsMAN that a given CAP (WIFIWAVE2) is locked to? In CAPsMAN without WIFIWAVE2 it’s as easy as setting lock to disable and then enable it afterwards to be open for a new CAPsMAN. Not so easy with WIFIWAVE2 it seems …
Response from MikroTik support: Apparently it’s not possible at this point (ROS 7.9.1), so other than completely resetting cAPs, you can only disable locking and limit CAPsMANs to associate with.
They will look into making this possible.
This is an automated message. Our bug tracker reports, that your issue has been fixed. This means that in the upcoming days, we plan to release a RouterOS update with this fix. Make sure to upgrade to the next release when it comes out soon. To be sure this specific fix is included, read the changelog when the next version comes out. If your issue is not mentioned, it might mean it will be in the next release.
Looks like it’ll arrive with 7.11. 
http://forum.mikrotik.com/t/v7-11beta-testing-is-released/167585/1