Pass argument to XML mapping

I'm trying to pass a list of objects to an XML mapping, but I am not able to choose the list in the 'Export XML' microflow action. The dialog for 'Export XML' shows '(none)' for 'parameter type', so guess there should be a way to define a parameter type. How do I do this?
1 answers

Open your domain-to-xml mapping. First one in the property list. Be sure that is related to entity that is exported.