Amazon SP API Feed POST_ORDER_FULFILLMENT_DATA Error ResultMessageCode 25 [closed] - amazon

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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

Answer 2

In the amazon feed, the main issue is formatting we have to submit the feed document in a proper format otherwise you always face the issue.
I just format the code in a proper way and got success again.
The should be a proper indent or better to use the plugin in your IDE to format the XML

Answer 3

In my case I was sending an incorrect dateTime format under FulfillmentDate tag.
Changing it to the iso-8601 did the trick https://developer-docs.amazon.com/sp-api/docs/iso-8601
val utcTZ = TimeZone.getTimeZone("UTC")
val calendar = Calendar.getInstance(utcTZ)
val shippedDate = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'").setTimeZone(utcTZ).format(calendar.getTime)
<FulfillmentDate>$shippedDate</FulfillmentDate>