About updating the NetBackup volume configuration
The robot inventory option updates the database to match the contents of the robot. If the robot contents are the same as the EMM database, no changes occur.
For a new volume (one that does not have a NetBackup media ID), the update creates a media ID. The media ID depends on the rules that are specified on the Advanced options section.
For API robots, the update returns an error if the volume serial number or the media ID contain unsupported characters.
For robots without barcode readers, the new media IDs are based on a media ID prefix that you specify. Similarly, for volumes without readable barcodes, the new media IDs are based on a media ID prefix that you specify
Robot inventory update returns an error if it encounters unsupported characters in the volume serial number or media identifier from API robots.
See Update the NetBackup volume configuration with a robot's contents.