Amazon SP API Feed POST_ORDER_FULFILLMENT_DATA Error ResultMessageCode 25

Question

I'm getting error from feeds API. I've tried with and without Item tag section, chaneging shipping cariers and dates, but it did not help. Any ideas what else could be wrong? Request document:

<?xml version='1.0' encoding='UTF-8'?>
<AmazonEnvelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="amzn-envelope.xsd">
    <Header>
        <DocumentVersion>1.01</DocumentVersion>
        <MerchantIdentifier>???????</MerchantIdentifier>
    </Header>
    <MessageType>OrderFulfillment</MessageType>
    <Message>
        <MessageID>1</MessageID>
        <OrderFulfillment>
            <AmazonOrderID>305-8114363-8651532</AmazonOrderID>
            <FulfillmentDate>2022-08-31T12:00:00</FulfillmentDate>
            <FulfillmentData>
                <CarrierCode>UPS</CarrierCode>
                <ShipperTrackingNumber>xxxxx</ShipperTrackingNumber>
                <ShippingMethod>Standard</ShippingMethod>
            </FulfillmentData>
        </OrderFulfillment>
    </Message>
</AmazonEnvelope>

And getting Feed document response

<?xml version="1.0" encoding="UTF-8"?>
<AmazonEnvelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="amzn-envelope.xsd">
    <Header>
        <DocumentVersion>1.02</DocumentVersion>
        <MerchantIdentifier>xxxx</MerchantIdentifier>
    </Header>
    <MessageType>ProcessingReport</MessageType>
    <Message>
        <MessageID>1</MessageID>
        <ProcessingReport>
            <DocumentTransactionID>51256019234</DocumentTransactionID>
            <StatusCode>Complete</StatusCode>
            <ProcessingSummary>
                <MessagesProcessed>1</MessagesProcessed>
                <MessagesSuccessful>0</MessagesSuccessful>
                <MessagesWithError>1</MessagesWithError>
                <MessagesWithWarning>0</MessagesWithWarning>
            </ProcessingSummary>
            <Result>
                <MessageID>1</MessageID>
                <ResultCode>Error</ResultCode>
                <ResultMessageCode>25</ResultMessageCode>
                <ResultDescription>We are unable to process the XML feed because one or more items are invalid. Please re-submit the feed.</ResultDescription>
            </Result>
        </ProcessingReport>
    </Message>
</AmazonEnvelope>

Answer 1

Removing ShippingMethod did the thing