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If the direction of a join is incorrect, it can be changed by right-clicking on the join and choosing Flip direction.
REPLACE WITH THIS IMAGE: Images/Relationships/Changing the Direction of a Join.png 
To change the direction of a join where multiple relations are shown as one link in the diagram...
- Right-click on the link and choose Flip direction:
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- From the the Choose foreign key join dialog, select the relation from the drop-down list and click OK:
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