One to many mappings delete problem

Question

in using Toplink 9.0.3, I have modeled a simple one to many relationships and have ran into errors on deletion.
The following is an object model that fails to delete
diagram has one to many companies ( privately held )
companies have one to many ownerships ( privately held )
ownerships have a one to one to an owner company and an owned company ( not privately held ).
In the simplest scenario, Toplink knows how to delete a diagram. It will delete an ownership, then delete the companies and then delete the diagram.
However in a diagram where a company owns two companies, Toplink fails. It attempts to delete an owned company before deleting the parent Ownership.
Note that if toplink deleted the owner company then, it would know to delete the many ownerships first.
How do we tell toplink that on deleting a company,
1. delete all the ownerships in its one to many
2. and delete all the ownerships in which the company
plays the role as an owned company.
Note that deleting an ownership should not trigger a deletion of either the owner company or the owned company.
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Answer 1

Hello,
You appear to be missing a mapping in your object model.
TopLink decides its commit order, for both insertions and deletions based on the ONE TO ONE mappings in a project.
It appears that your company has no ONE TO ONE mapping to the diagram, which means that TopLink MAY decide to delete diagrams before it deletes companies.
I would suggest that you try adding a one to one mapping from company to diagram, correctly populated, and see if the problem recurs.
I hope this is of some help,
Christian