>Here's a thought: I have the child bizobj dropped on a cListObjEdit container on page2, on the same page as the parent bizobj's form controls for PO number, dates, etc... Should the child bizobj be on it's own page?

It's easier to picture it that way, but shouldnt really be necessary. The trick is the zorder of the bizobjs. Since the child bizobj holds reference to the parent, the parent needs to exist first.

Check your Zorder with the object list combo at the top of the property sheet. Should be:

Form
- MM_Line
- oSessionEnvironment
-- Label
- ChildBizOj
-- (containship objects)
- ParentBizObj
-- (containship objects)

Beware when you play with Send to Back, you have to close the prop sheet & re-opened to see revised zorder. HTH