Questions about mobility rules (ITN 2020)

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Hello everyboday and happy new year!!!

I contact you regarding a question that has arisen about ITN-s. Specifically, researcher asks me that if you participate in an ETN  in order to obtaining a doctor's degree, if you can co-direct for the doctoral thesis and if so with what requirements, that is, the another part that codirect has to be from another country? In addition, the professor has to meet some specific requirements and what type of contract should he have with the beneficiary?
I was looking in the guide for aplicant and I can't find this information.

Thank you very much 

Best regards

Pilar

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