Some questions about data source plugin

There is some datasource (H2 database) with two tables: Rank and Person. One rank have many persons (one to many relationship see attachment). Then I click diagrams and show visualization, generates diagram, that show one to many relationship with arrow to Rank. This is not ER diagram. Which convention do you use to paint diagram in this way?
Additionaly I want to notice, that if I use Postgresql 7 (I know it is an old version but I have to use it), diagram is generated without any relationships, and there are errors shown that some tables cannot be found (additionaly "invisible" table per each existing table).



Attachment(s):
diagram.PNG

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