You are creating an interface and pass data out to its parent interface. What type of variable is used to achieve this?
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Rule inputs. You can use RI to pass data IN and OUT of an interface.
why not parameterised process variables ?
Depends on the context where we using those interfaces , If we are using those in User input tasks we gonna go for Process variables . I mean data in interface gets saved in Rule inputs first, from there data get transferred to process variables...(Two way transactions). If you use it in Process model