Each database backup volume contains a Tivoli® Storage Manager backup type code in the volume header. An invalid backup type code indicates that this volume is either corrupted or not suitable for restoring the database.
The server does not process the DSMSERV RESTORE DB command.
Check the volume history file to make sure this volume is valid for a database backup operation. If this volume is corrupted, restore the database to a different time using a different set of backup volumes.