hey all, getting an 'unexpected error' with the following simple sales order request, not sure how to troubleshoot. hoping someone may be able to give me some suggestions of things to try?

<soap-env:Body>
        <add>
            <record xsi:type="tranInvt:SalesOrder" xmlns:xsi="<http://www.w3.org/2001/XMLSchema-instance>">
                <entity internalId="18508 customer"/>
                <tranDate xsi:type="xsd:dateTime">2020-04-08T18:16:44.000Z</tranDate>
                <otherRefNum> OO-584F </otherRefNum>
                <itemList>
                    <item>
                        <item internalId="24698"/>
                        <quantity>24698</quantity>
                        <price internalId="1"/>
                        <rate>200</rate>
                    </item>
                    <item>
                        <item internalId="26251"/>
                        <quantity>26251</quantity>
                        <price internalId="1"/>
                        <rate>200</rate>
                    </item>
                    <item>
                        <item internalId="12703"/>
                        <quantity>12703</quantity>
                        <price internalId="1"/>
                        <rate>200</rate>
                    </item>
                    <item>
                        <item internalId="26513"/>
                        <quantity>26513</quantity>
                        <price internalId="1"/>
                        <rate>200</rate>
                    </item>
                    <item>
                        <item internalId="11090"/>
                        <quantity>11090</quantity>
                        <price internalId="1"/>
                        <rate>200</rate>
                    </item>
                    <item>
                        <item internalId="10903"/>
                        <quantity>10903</quantity>
                        <price internalId="1"/>
                        <rate>200</rate>
                    </item>
                </itemList>
            </record>
        </add>
    </soap-env:Body>