Iterate on generalization instead of on specialization

Hello,  I am using the Community Commons Clone function as a way to change the specialization of an object. I thought that I would be able to do that by cloning their common generalized object. But cloning fails due to a difference of of fields between source and target. And this seems to happen because even though the iterator that feeds it to the clone function is set to a list of the generalization object type, the iterated objects are automatically cast into their specialization.    How can I prevent that from happening?
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