Rule Inputs in interface

Good Day Everyone!

I'm having a problem on how to use the foreign key on my CDT so that I use another Record type as Rule Input, but when I used the Interface in a process model, I'm having a problem on the variables because I used a record type as a rule input. also I can't use the can't call the rule input in the context under Related action on my record type because of the same problem that I used a record Type as a Rule Input. what should I do?

Thank you!! 

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