Data Template can't be edited when it is in use

[rprofijt]

Describe the bug
After upgrading to 1.2.5 we wanted to change the maximum value in a data template that is being used, on save it gives an "Save Failed due to field input errors" this seems to be because the page thinks the Internal data source name is missing, it is not, but it is greyed out/pre-filled. This does work in 1.1.3.8 and on a data template that is not in use.

To Reproduce
Steps to reproduce the behaviour:

1. Go to Templates -> Data Source
2. Click on a data template that is in use and edit the Maximum Value
3. Click save
4. See error

Expected behavior
The data template gets edited with the new maximum value

Screenshots

Desktop (please complete the following information):

• OS: Linux
• Browser: Firefox
• Version: 67.0.4

[cigamit]

Oh, darn. I did not test that. Let me fix it now.

[cigamit]

All fixed up now.

[eholz1]

This does not help me. If I have no devices I have no data source templates. If I add a router or switch, then I get datasources and a datatemplate. I want to change the collection to 5 min for the cpu usage.
My default preset is 1 min. the 5_cpu name is greyed out on the form, and will not let me select the option to allow user to change preset on device creation - How can I do this?

[eholz1]

oops, better forget above comment - found this:

[netniV]

Why do you have so many 1 minute collections to? Do they have different time spans?