Ibera transfered the daily A320 service to Air Nostrum to operate it with a CRJ 900 at then end of March and a second daily started on Firday 24 June.
A little pointless as 2 CRJ 900 have the same amount of seats as a A320.
Iberia have to update the DUB airport system as they changed the flight numbers to IB instead of YW. It should show the second flight as Ibera on the website soon.
The only benefit will be for the winter when they operate daily with the CRJ instead of 4 weekly A320. It's expected to be CRJ 1000.