From an Action Type, how do I call a function that uses a custom type?

[rucker]

An action type rule can call a function. However, my function has a custom input type and I am getting this error when I try to reference it in my action type rule:

or, if I remove the inline destructure:

How do I call a function with a custom type in an action type?

[timurm]

This does not appear to be supported by Actions. I tried to create an Action in Ontology Manager and I get a similar error:

(In this case, MyCustomType is an interface with a single Integer field.)