An action/response may occur more times in the model and you want to rename all of them so that the implementation remains. You may also want to modify only a given step so that the name of the others remains with the implementation.
Here is the solution for both.
When you select rename, then both actions will be “add items < ten”, and the implementation remains:
When you select duplicate, then the other action with the originally identical name remains add items < 10:
Finally, if you modify the name and press ESC, then the modified action/response became unimplemented:
Note that the empty node has no implementation, the filled node has.