It is not possible to force a backup for the specified file using the FORCE BACKUP command. This file was either backed up using an API client or by an ADSM version 2 client or higher.
The force backup operation continues, the state of the compression record for this file is updated.
If the file was backed up using a Version 2 client, or higher, you may remove this entry as a candidate, using the REMOVE COMPRESSION command. If the file was backed up using an API client, notify the client owner to again back this file up. Do not remove this entry until it becomes an "inactive" entry.