Your ticket is valid for fare zones 37 and 38, which is the city of Dortmund.
In the evenings (from 7 pm) and on weekends, you can use the ticket to travel throughout the entire southern region of the VRR (including to Unna); at other times, you need an additional ticket.
You misunderstood something there.
Your ticket is valid for fare zones 37 and 38, which is the city of Dortmund.
In the evenings (from 7 pm) and on weekends, you can use the ticket to travel throughout the entire southern region of the VRR (including to Unna); at other times, you need an additional ticket.
http://www.vrr.de/imperia/md/content/tickets/vrr_totalraum_general_2015.pdf