Relationship '<0s>' was modified or deleted since the diagram was loaded.
A modified relationship is about to be saved. It is possible that a table involved in the relationship has been deleted from the database by another user.
Verify whether this relationship is meant to be modified. Changing or deleting a relationship for a table may affect other tables.
| Database Diagrams | How to delete a relationship (Enterprise Manager) |
| Deleting Key Relationships Using Database Diagrams | Working with Database Objects |