Host LUN ID conflicts

I have a Solaris host in host group A and masking view A with host lun ID 0 - A.  Now, I want to add this host to host group B and masking view B with host lun ID 0 - F already occupied.  I guess this cannot be achieved without shutting down all the host in one of the masking view (then, remove the luns and re-add them back with a different host lun ID)?  

This is more for migration.  I know another way is just to add the luns from masking view B to masking view A.