EDIT

For now it could look like this:

There is a label showing the current sortindex

e.g. "Order: 1"

with buttons for "+","-" and delete beside.

• increments, - decrements and delete removes it.

Alternatively we can have a field that only allows integer and can be edited directly by the user. But I think that buttons are still helpful.

Additionally the order in the factual data view should be according to the sort index value. If this is more difficult to implement this could become a separate ticket.

For more details see #8004