Header and Item Odata through SEGW

Hi,
I know that this Topic was raised million times, but still raising this query. I have already consulted http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/e0d92637-3d0d-2f10-ebb2-efc1f40a85e8?QuickLink=index&… link.
Requirement: Create Header and Item Odata THROUGH SEGW.
Steps I have followed:
1. Created Header and Item Structure and have added them in the Export Parameters of an RFC.
2. Created the RFC and have populated the the internal tables corresponding to the Header and Item structures.
3. Go to Transaction SEGW and Imported the Header from the RFC. Then created Read and Query mapping for Header.
4. Go to Transaction SEGW and Imported the Item from the RFC. Then created Read and Query mapping for Item.
5. Created an association between "ID" of Header with "ID" of Item. Cardinality- 1:N
Observation:
Now when I run the Odata and execute /sap/opu/odata/sap/ZTEST_SRV/HDRSet(2)/ITEMSet, I get all the Items from the Item table for Each and every Header. But I guess for every header corresponding Items should have been enlisted.
Is there any step that I am missing?
Important: In the MPC class(ZCL_TEST_MPC), I could see a method named DEFINE_ASSOCIATION. I have put an external Breakpoint in it, but this breakpoint is not triggered.
-Regards
Dhrubajyoti

Hii Dhru,
In addition to the steps followed, you have to create navigation property using association created.
You have to implement Get_expand_entityset method in DPC method for multiple headers and corresponding items and for single header and corresponding items you have to implement GET_EXPANDENTITY method.
The URL is as format below :
/sap/opu/odata/sap/<service name>/<Header entity set>/?$expand=<navigation property from header to item>&$filter= eq '<ID>' '<value>'
Example URL : https://<server>:<port>/.../<service_name>/SalesOrders?$expand=SalesOrderItems
For reference :
https://help.sap.com/saphelp_gateway20sp08/helpdata/en/ca/c683e803494b77a2e1290b987556e2/content.htm
When GET_EXPANDED_ENTITYSET method invoked
For get_expanded_entity_set method implementation please refer the below URL
http://scn.sap.com/community/gateway/blog/2014/07/18/implementing-expand-entityentity-set
Regards,
Lokeswar Reddy byni.

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