Deep Insert does not get triggered in Gateway

Hi All

We are trying to make a deep insert call ffrom UI5, however the create deep entity method on Gateway does not seem to get triggered. The request always go to create entity method

var oEntry = {
CatId: "22",
Warehouse: "222",
NodeId: "015",
QuestionId: "00003",
AnsSetId: "00003",
AnsId: "00001",
TableName: "/GLB/KGTT_RF_PAR",
FieldName: "REC_METHODLOGY",
Sign: "",
SelOption: "",
LowValue: "",
HighValue: "",
Status: "",
Plant: "2"
};
var Header = { Warehouse:"222", Action:"2", ResponseSet:[oEntry]};

oModel.create("/HeaderSet",Header,{        success : $.proxy(function(oData,oResponse){        console.log("sucess>>>>"+oResponse) ;        },this),        error : $.proxy(function(oData,oResponse){             },this)        });

The payload looks correct. However it does not trigger the create deep entity method.

we are using v1.36 of UI5.

Any pointers?

Thanks

Sandip