The Container Class report lists all container classes that are specified to BRMS. This report is produced as a result of running the command WRKCLSBRM TYPE(*CNR) OUTPUT(*PRINT). Choosing option 7 from the BRMPRTINV menu can also print the report.
The following should be noted about this report:
If a container is automatically unpacked when media expires in the container, the association between the expired media volume serial and the container is removed. You can use the media and assign the media to another container. Likewise, you can assign the container to other volumes.
If the volume is not automatically unpacked, the relationship between expired volumes and the container that the volumes are in is left intact in the media library. The volumes are still assigned to the container, even though the volumes are expired. They will remain assigned until you manually remove them from the container.