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After dragging the little dots on an entity to the canvas and selecting/creating a “to one” related entity in the “Find or create entity to insert” interface, the new entity gets added to the whiteboard with a “regular” line (instead of the relation line) and the relationship between the entities is not actually made.
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When two entities that are related through a “one to one” relationship are on both on the canvas and the “show relation entities” setting is turned on, the relationship line between them is not displayed.