FKs are not shown in secondary diagram

[dserodio]

I like to use different diagrams for different perspectives of a model.

If I:
1) Create a diagram
2) Add 2 classes to this diagram
3) Create an association between these classes
4) Create another (secondary) diagram
5) Drag the 2 classes to this diagram

Then EA automatically shows the association in this second diagram. However, the same thing doesn't happen if the classes are <<table>>s (Data Modeling profile), and the associations are Foreign Keys.

Is this a bug, or have I missed a configuration option somewhere?

Thanks,
Daniel Serodio

[dserodio]

I forgot to mention: I'm using the IDEF1X notation for these diagrams.