Relationships Diagram
The lines that connect entities in a diagram represent relationships between those entities.
The head of the arrow shows the direction of the relationship.
The colour of the arrow shows the status of the relationship:
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Black indicates the relationship is current.
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Red indicates the relationship has been deleted.
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Purple indicates more than one relationship exists between the entities, and at least one relationship has been deleted.
You can customise these colours by selecting your username > Preferences.
If there is more than one relationship between two entities, you can hover on the relationship label to see details about the relationship.