How to clean up BCV pairing that no longer valid?

I have a few BCV device that I'm trying to recycle/used for other STD devices.

symbcv list -sid shows something like this:
BCV Device standard device status
physical symm physical symm BCV<==>STD
Not visiable 0004 0 Not visiable 00EB 0 split

so it appears symm device 0004(BCV) and "00EB"(STD) has a
prior pairing relationship.

Now I want to use "0004" and have it paired with another STD , say "03E0",

so # symbcv -g associate dev 0004
followed by # symmir -g query,
or # symbcv list -sid
still shows no pairing relationship between 0004 and "03E0".

so my question: How to I properly cleanup a prior pairing relationship
that is (1) no longer valid and (2) not showing up in any disk group ?

Thank in advance.
Jason