Search invoices based on InvoiceDFF context based fields

Summary

Search invoices based on InvoiceDFF context based fields

Content

Hi,

We are using saas application standard REST API to get invoices.

Now, we want to search invoices based on  invoiceDff context based fields. This API should return invoices based on invoiceDff fields condition like q=invoiceDff.queueName='processed'.

{
    "items": [
        {
            "InvoiceId": 45,
            "InvoiceNumber": "297110",
            "InvoiceCurrency": "CNY",
            "PaymentCurrency": "CNY",
            "InvoiceAmount": 8296.2,

            "invoiceDff": [
                {
                    "InvoiceId": 45,
                    "__FLEX_Context": "Scanning Data",
                    "__FLEX_Context_DisplayValue": "Scanning Data",
                    "ponumber": null,
                    "ponumber_Display": null,
                    "queueName": "Processed"

}]

]}

We have tried something like below 

https://********oraclecloud.com:443/fscmRestApi/resources/latest/invoices?expand=invoiceDff&onlyData=true&q=invoiceDff.queueName='Processed';

but it throws error :