Multi-level linking between VOs

I am a ADF-Jdeveloper newbie. I am trying to develop a shopping cart based on the following tables.
I have 4 tables-
ItemTable which contains the name and the category to which an item belongs,
categoryAttributes which consists of the attributes which are valid for a particular item category(attribute id) ,
itemAttributes which consists of the following- Item id-i.e. the id of item, attribute id-which is taken from categoryAttributes, attribute value-which has to be filled by the user. And
Lookupvalue table which has the lookup value id and lookup values.
The lookupvalue id is attribute id.
I need to create a UI where the itemAttr table is shown
In this table,I need to show the item id-which should be taken from the item table,
attribute id-has to be taken from the categoryAttributes table only since it contains the ids specific to the category.The values for these ids have to
be displayed from the lookup value table.
I have created a parent child relationship between Item and Category Attributes & Category Attributes and Item attributes.
If i drag the child of category attributes,only category specific attributes are displayed. and if i drag the child of Item,only item id is copied.
How can I implement this 3 table linking where both item id and attribute id can be taken from the parent and the grandparent?
Any help will be highly appreciated.
Thanks and Regards,
Chaya Bhandari

sometimes i h'd this problem.
atlast where i did my mistake. there is no matching records
bychance it happens for you also
eg:
  employeeid  employeedesc
        100        xyz
          deptid empid deptdesc
           5000     101     ccc
               managerid, mangerdesc    
                    999          LLLno matching peform with one another . so it may happens
if like this means
  employeeid  employeedesc
        100        xyz
          deptid empid deptdesc
           5000     100     ccc
               managerid, mangerdesc    
                   100          LLLyou can get the mutilevel

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