Custom function with openUrl to open URL that has been entered in form does not work?

Custom function with openUrl to open URL that has been entered in form does not work?

I am having some issues with the custom actions. 

I have a form called "Suburbs" in which I have two fields, "Suburb" (which is a text field) and "RPData" (a URL field).

I want to create a view which has two columns, the "Suburb" field and a custom action "View Suburb Profile"

I have defined the custom action: 


I then have created a view, where I can select a suburb, and then click on the custom action View suburb profile, which I want to then launch the RP_Data URL for that suburb. 
However, when I execute the custom action, I keep getting this message: 


why is zoho inserting /darrenstandish/propertyprosperity/ before my link?
Is there a way to correct this? 
Thank you, 
Bianca.