jhayka, try checking in one component at a time. also go to ePO > Extensions to see if there are any previous version of DE Out of band mgmt extension. If it exists, you can remove it and try to check in again in software manager.
When I try to delete the 7.1 out of band It also fails
Server Task Log Details
Server Task Log Information
6/7/17 9:11:15 AM
Less than a minute
6/7/17 9:11:15 AM Started: Remove Components
6/7/17 9:11:15 AM Removing extension 'Drive Encryption : Out Of Band Management extension'.
6/7/17 9:11:21 AM Command Failed: an error occurred while trying to uninstall the extension EEDEEP.
6/7/17 9:11:22 AM Failed to remove extension 'Drive Encryption : Out Of Band Management extension'.
6/7/17 9:11:22 AM Completed: Remove Components (The component(s) failed to be removed.)