how to drill down Sub-Levels untill 2/3 layers. SAP Cloud Platform Integration :

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Dear SAP Guru's.

I'm trying to go 2 sub levels lower. I'm able to go to more than 1. If I go to the Itemset then I'm able to get the sublevels that are under the item set, So I believe is correctly made in the OData Gateway.

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I found the anwser here: https://answers.sap.com/questions/202022/hci-pi-additionalobjectreference-in-odata-payload.html