On attempt to resolve a conflict for a container the following error message is displayed:
The application Pp11 postfix requires another application Pp11. Or cancel the selection of Pp11postfix, please select the Pp11 with Pp11postfix.
Applications may be different in your case.
There is a dependency set for the affected application in OBAS under
Top > Service Director > Virtuozzo Manager > Applications > <Application_name> > Dependencies tab.
The above error message indicates that the required application is not installed on the Container.
Please either install the missing required application package on the container in question or remove the dependency.
Please note that a missing dependency may cause issues like the one described in this Knowledge Base article.