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The Iberia site does not cover partner award cancellations well other than Vueling which they expressly say you will not get points back for.
Personally, I would only book an Iberia flight through them since the results seem mixed for partner cancellations.
I would look at BA instead to see if I could book there for partners.
With a lack of a clear policy, I would not take a chance.
See the section under Are my Avios refundable.