Using variables in Family name

[sean33040]

Creating a a backup job and BE WS 9.1 manual and help says:

Specify a name for the new or overwritable media.
This name is used to identify the media in the
Restore Selections dialog boxes. The family name
defaults to “Media created date time”. To customize
the family name, you can use any combination of the
following variables in this field:
%s - includes the media server name
%j - includes the job name
%d - includes the date the media was created
%t - includes the time the media was created

When I try this (type: %j created %d %t in the field)
I see just that: literal "%j created %d %t" (without quotes)

Does anyone know how to enter a custom family name using these variables?

Thanks.