XSOdata with Navigation Property
A sample example for XSOdata with Navigation Property
Scenario of Purchase Order(PO) Header and Item: In a single service we can navigate to Item level from Header to Item with Association .
Lets start with very basic example of VBAK (PO Header), VBAP(PO Item).
Example Code in a .XSOdata file
service namespace "workshop.aisurya.XSOdata" {
"<YourSchema>"."VBAK" as "POHeader" with ("MANDT","VBELN","ERDAT") navigates ("ToPoItemAssctn" as "ItemRef");
"<YourSchema>"."VBAP" as "POItems" with ("MANDT","VBELN","POSNR","MATNR","ARKTX");
association "ToPoItemAssctn" principal "POHeader"("VBELN")
multiplicity "1" dependent "POItems"("VBELN") multiplicity "*";
}Below Image for reference
Activate the changes and Run As XS Service.
Lets check the Metadata of service.
https://<Host:Port>/workshop/aisurya/XSOdata/po.xsodata/$metadata
As highlighted in the image(ItemRef) is a navigation property from Header to Item level.
Lets test the service only for 2 records by providing query option as (top=2).
https://<Host:Port>/workshop/aisurya/XSOdata/po.xsodata/POHeader?$top=2&$format=json
Here ItemRef is the navigation property of corresponding PO Items with URI. We can explicitly open in new tab and get the result also .
Now lets check Expand option for Showing Header and Corresponding Items.
$Expand Feature to fetch Corresponding Item along with Header.
https://<Host:Port>/workshop/aisurya/XSOdata/po.xsodata/POHeader?$top=2&$format=json&$expand=ItemRef
POHeader (MANDT=’800′, VBELN=’0000004970′)
Now this service can be consumed in different UI ‘s depending upon the requirement.
can you please explain how to consume this URI into the UI elements like tables ? for eg : i have a deader table and when i click i want another table to fill with item details.
This might help
https://archive.sap.com/discussions/thread/3928243
Hi Aishwarya,
Many thanks for your post, it's make me helped to understand the syntax of OSDL of the navigation property (association).
Well done 🙂
You are welcome.
Hi Aisurya,
Thank you for the information!
Could you please tell me how we can add conditions in the code? Ex. If I need VBTYP = 'C' records, In this case how can I add my condition?
Hi Divi,
You have to pass the filter parameters like
for eg :  POHeader (MANDT=’800′, VBELN=’0000004970′)
Thanks,
Aisurya
Thanks  Aisurya Puhan ,
for this wonderful Blog,
but some of the fields in this code i did not understood.
could you please help me out.
this "MANDT","VBELN" are all column fields.
and what is inside this navigates?
if anyone knows please reply ASAP.
Hi Harish,
Yes these  (“MANDT”,”VBELN” ,"ERDAT" ) are the columns from Header (POHeader) as a key and it navigates to the association. And the association is nothing but the Items (POItems).
Aisurya