Bottom up reduction

If the implementation model was generated without inheritance, this method is chosen by definition. No context messages are inherited from the referenced tables. To explain the bottom up reduction we assume the model was generated with full inheritance.

Use the bottom up reduction when you do not want to inherit anything from a referenced table and none of the tables that refer to the current table needs a context message of a referenced table.

In this example the reference from Item to Unit is changed to "hidden". The Item does not inherit the messages related to Unit (on the top), the Line will not inherit it either. The Line will still inherit the Unit that is on the right side of the diagram.