If I remember correctly it used to be that adding an ID of a higher taxa automatically counted as an explicit disagreement, but then enough people had situations where they didn’t intend that that the two-option-system we have was added.
@upupa-epops, I remember why it was changed to a two-options system. But adding the second option automatically nullifies the purpose of having the first option, in my opinion. When I am in front of an observation which already received a species ID, adding my higher level taxa through the first option adds no information to the community. I would either confirm the species ID or disagree with it or do nothing. My opinion.