Tuning details sometimes cannot be changed through the TV Server configuration TV/radio channel tuning detail editor. In particular:
- DVB-C tuning details cannot be changed at all (save validation fails)
- tuning details cannot be saved when the network ID is 0. Tuning details with such a network ID are relatively common among DVB-IP channels

h4. Steps to Reproduce
1. Open TV Server configuration.
2. Go to the TV channel list.
3. Attempt to create a DVB-C channel manually.
4. (Saving the tuning detail will fail.)

1. Open TV Server configuration.
2. Go to the TV channel list.
3. Attempt to change the details for a DVB-C tuning detail.
4. (Saving the tuning detail will fail.)