There is an option Change Root Password displayed in CP for container-based subscriptions.
Change Root Password is displayed regardless of parameter Root Access that is set under
Top > Billing Director > Product Manager > Hosting Plans > "<hosting_plan_name>" > Container Properties tab.
Such behavior was classified as the software issue PBAS-30428 and was fixed in OBAS 4.5.7 release.
To resolve the issue, please upgrade to 4.5.7 as described in How to upgrade OBAS system to the latest available version.
Workaround for 4.5.6
If upgrade is not an option for you, there is a hotfix for 4.5.6 version. To install the hotfix, please download 64-bit hotfix or 32-bit hotfix depending on your OS and install it by running the commands below.
For 64-bit OS:
# rpm -Uvh hspc-cp-server-4.5.6-50.swsoft.x86_64.rpm # service hspcd restart
For 32-bit OS:
# rpm -Uvh hspc-cp-server-4.5.6-50.swsoft.i386.rpm # service hspcd restart
Warning: Restart of the hspcd service will cause OBAS downtime for about 10-60 seconds.