Suggested by an editor.
User case: The user adds a statement in the property "father" with everything filled, reference, rank and so on, and then realize I made a mistake, and this statement should go to the property "mother".
Other case: He wants to modify an item, agrees with a statement that is already added but thinks this would be more relevant in another property.
Then, the user needs a simple and quick tool to move the content of a statement from a property to another.
This could be for example a way to drag-and-drop the statement to another property (a new one if necessary)