How to retrieve multiple work orders with "Invoice Number"?

Can you please provide a sample payload that will return the invoice number in the response for "authorized" work orders.

The section of the response "Number" field where I believe the data is supposed to be, always returns an empty element.

<CheckClearDate xsi:nil="true"/>
<GlAccount>6740100</GlAccount>
<Number/>
<VendorInvoiceDate>2021-04-21T00:00:00</VendorInvoiceDate>
<VendorInvoiceReceivedDate xsi:nil="true"/>
<VendorInvoiceTotal>