AI Agent Studio Query on Child Attribute fails if used without fields

Summary:Hi, We have created an agent that uses the Business object purchaseOrders as follows

https://<Instance>.oraclecloud.com/fscmRestApi/resources/11.13.18.05/purchaseOrders?q=lines.Item='ItemName'&onlyData=true

The above works perfectly fine and gives us data as follows

{    "items": [{}],"count": 25,    "hasMore": true,    "limit": 25,    "offset": 0,    "links": [        {            "rel": "self",            "href": "https://ejtp-test.fa.em2.oraclecloud.com:443/fscmRestApi/resources/11.13.18.05/purchaseOrders",            "name": "purchaseOrders",            "kind": "collection"        }    ]}

Where as if we add fields list as shown below, We do not see any results.

https://<instance>.oraclecloud.com/fscmRestApi/resources/11.13.18.05/purchaseOrders?q=lines.Item='ItemName'&fields=Status,ProcurementBU,OrderNumber&onlyData=true

{    "items": [],    "count": 0,    "hasMore": false,    "limit": 25,    "offset": 0,    "links": [        {            "rel": "self",            "href": "https://ejtp-test.fa.em2.oraclecloud.com:443/fscmRestApi/resources/11.13.18.05/purchaseOrders",            "name": "purchaseOrders",            "kind": "collection"        }    ]}