Bug description

I have a nullable datetime field in a collection. For a record, I have set the datetime field to a value. However, now I want to remove this value and set it to null. This is not possible via the admin UI.

Before:

(Save changes button is disabled without any changes)

After:

(Save changes button is still disabled even after I removed the wasWrittenOn field value usin backspace)

Possible Solution

Have a small X at the end of each nullable input which can set the value of that input to null (with a tooltip saying so).