Example Diagram of a Hierarchy

LEVEL S REC SH01                                    1 SHIPMENT                                        
                                                     /        \                                         
LEVEL O REC OR01                               2 ORDER      7 ORDER                          
                                                /     \           |                      
LEVEL P REC PA01                           3 PACKS  6 PACKS       |                           
                                            /     \               |                    
LEVEL I REC IT01                       4 ITEMS   5 ITEMS       8 ITEMS