Problem with Script Action in Orchestrator

Greeting,

I've been trying to create a dynamic drop down list in vRealize using Action Script in Orchestrator, following this guide:

http://2vsteaks.com/find-vro-workflow-used-xaas-service-blueprint-vra-7/

The thing is, when I created a property definition with External Value to use Action Script, I couldn't see the script that I created in Orchestrator

I'm having a real headache here. Could anyone provide some guidance?

Regards.