Selecting custom requirements attributes in Schema Map

[patrick.d.barnes@nasa.gov]

I have a DOORS module with several attributes beyond what Requirement stereotype holds.
How is it best to add those attributes to Requirement?
I have tried creating a new stereotype, generalized from Requirement, and added attributes there.
However, I am unable to select (or see) that custom stereotype on the schema map selection.

For instance, my DOORS module has a "rationale" attribute. I would like to bring that into MD into a "Rationale" attribute in a Requirement.
What is the best way to do that?
I have been searching all day for a solution.

Thank you very much