Modeling question

Hello,

I have an Attachments data map that has an Attachment ObjEntity mapped =
to the ATTACHMENT DbEntity.

In a separate data map named Main, I have a ClaimAttachment ObjEntity.  =
I want this to be a child of the Attachment ObjEntity.

In the Cayenne Modeler I click on the ClaimAttachment ObjEntity and in =
the ObjEntity Configuration section I see an Inheritance drop down.  The =
only option in that drop down is "Direct Mapping to Table/View=E2=80=9D. =
=20

Shouldn=E2=80=99t this drop down list have the Attachment ObjEntity =
listed there?  The Attachment ObjEntity has the Abstract class check box =
selected.

Thanks in advance for any help,
Ricardo Parada