Hi

I have an issue to drag an drop a field.

In the right window of the fields in edit mode are displayed availables fields.

Among them there is a field with a black arrow.
Let’s say it is called "digital movie"
It is not possible to drag it.
If I click on it a few items are displayed :
Total- first -last -concatenate that are possible to drag.
I should like drag an drop the field "digital movie" : which one must I drag ?