Passing CDT as parameter between interfaces

I have two interfaces. I want to pass CDT rule input of interface 1 to interface 2 as a parameter. Consider CDT rule input as ri!details in interface 1 and ri!bookDetails in interface 2. I tried this code in expresssion mode of interface 1.
"rule!interface2(bookDetails:ri!detiails).

But its showing as error. Can anyone help me?

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