$wsdl = "http://api.vetrf.ru/schema/platform/services/2.0-RC-last/ams-mercury-g2b.service_v2.0_pilot.wsdl";

$submitApplicationRequest = [
    'apiKey' => '***',
    'application' => [
        'serviceId' => 'mercury-g2b.service',
        'issuerId' => '***',
        'issueDate' => '2018-06-10T12:00:00-05:00',
        'data' => [
            'getVetDocumentListRequest' => [
                'localTransactionId' => 'a10003',
                'initiator' => [
                    'login' => '***',
                ],
                'vetDocumentType' => 'OUTGOING',
                'vetDocumentStatus' => 'WITHDRAWN',
                'businessMember' => [
                    'businessEntity' => [
                        'guid' => '***'
                    ],
                    'enterprise' => [
                        'guid' => '***'
                    ]
                ]
            ]
        ]
    ]
];

$client = new SoapClient($wsdl, [
    'login' => '***',
    'password' => '***',
    'exceptions' => TRUE,
    'trace' => TRUE
        ]);

$client->submitApplicationRequest($submitApplicationRequest);

echo "ЗАПРОС:\n" . $client->__getLastRequest() . "\n";

<b>Fatal error</b>:  Uncaught SoapFault exception: [soap-env:Client]  in C:\xampp\htdocs\merkyriy_test\index.php:39
Stack trace:
#0 C:\xampp\htdocs\merkyriy_test\index.php(39): SoapClient-&gt;__call('submitApplicati...', Array)
#1 C:\xampp\htdocs\merkyriy_test\index.php(39): SoapClient-&gt;submitApplicationRequest(Array)
#2 {main}
  thrown in <b>C:\xampp\htdocs\merkyriy_test\index.php</b> on line <b>39</b>

object(stdClass)#2 (1) {
  ["incorrectRequestFault"]=>
  object(stdClass)#3 (2) {
    ["message"]=>
    string(22) "Request  is incorrect."
    ["error"]=>
    string(91) "Данные заявки обязательны для указания в запросе."
  }
}

<SOAP-ENV:Envelope xmlns:dt="http://api.vetrf.ru/schema/cdm/dictionary/v2" xmlns:bs="http://api.vetrf.ru/schema/cdm/base" xmlns:merc="http://api.vetrf.ru/schema/cdm/mercury/g2b/applications/v2" xmlns:apldef="http://api.vetrf.ru/schema/cdm/application/ws-definitions" xmlns:apl="http://api.vetrf.ru/schema/cdm/application" xmlns:vd="http://api.vetrf.ru/schema/cdm/mercury/vet-document/v2" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
  <SOAP-ENV:Header/>
  <SOAP-ENV:Body>
    <apldef:submitApplicationRequest>
      <apldef:apiKey>apikey</apldef:apiKey>
      <apl:application>
        <apl:serviceId>mercury-g2b.service:2.0</apl:serviceId>
        <apl:issuerId>issuerId</apl:issuerId>
        <apl:issueDate>2017-09-29T16:58:15</apl:issueDate>
        <apl:data>
          <merc:getVetDocumentListRequest>
            <merc:localTransactionId>a10003</merc:localTransactionId>
            <merc:initiator>
              <vd:login>user_login</vd:login>
            </merc:initiator>
            <bs:listOptions>
              <bs:count>10</bs:count>
              <bs:offset>0</bs:offset>
            </bs:listOptions>
            <vd:vetDocumentType>OUTGOING</vd:vetDocumentType>
            <vd:vetDocumentStatus>WITHDRAWN</vd:vetDocumentStatus>
            <dt:enterpriseGuid>ac264dc6-a3eb-4b0f-a86a-9c9577209d6f</dt:enterpriseGuid>
          </merc:getVetDocumentListRequest>
        </apl:data>
      </apl:application>
    </apldef:submitApplicationRequest>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>