Custom Work Item Attribute - How to use on multiple Work Item types?

I have created a custom work item attribute called "Business Area".  This work item attribute is an enumeration.

What I want to do is display this work item attribute under two types of work items (Work Item 1 and Work Item 2).  When I add the work item attribute to one work item I must specify an ID.  When I add the work item attribute to the other work item I am unable to specify the same ID.  When I add the custom work item attribute to the presentation view I must specify a single ID.  I want the two work item templates to display the same view.  From what I can tell, I must specify two different IDs when I add the custom work item attribute to the view.

Is there a better way of doing this?

Thanks for the help.

Cheers, Cam.