After copying one partition to another, as in the case of restoring a volume from backup, it may be necessary to re-designate you newly restored drive as bootable. First, make sure the volume is mounted. Next, in addition to using bootman to recreate your boot menu (if necessary), you may need to open a Terminal window and issue the command:
makebootable <volume-name>
where <volume-name> is the name of the volume as it is mounted at the time you issue the command.
Note that if you made an exact duplicate of a volume and mounted them both, the system would append a number one(1) to the second drive mounted.
Example: makebootable /BeDrv1