AirPriceReq error 10 with Infant ?

Hi all, I try to get a price with such call below. If I remove the infant, it works very well, but if I add the field, I get an error as response... I don't get why ?

Request :

<?xml version="1.0"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:com="http://www.travelport.com/schema/common_v42_0" xmlns:util="http://www.travelport.com/schema/util_v42_0" xmlns:air="http://www.travelport.com/schema/air_v42_0" xmlns:sys="http://www.travelport.com/schema/system_v32_0" xmlns:univ="http://www.travelport.com/schema/universal_v42_0">
  <soapenv:Header/>
  <soapenv:Body>
    <air:AirPriceReq TraceId="80461fce-7722-436d-ae2e-ba427e547aa0" TargetBranch="P7083098" AuthorizedBy="User" LanguageCode="FR">
      <com:BillingPointOfSaleInfo OriginApplication="uAPI"/>
      <air:AirItinerary>
        <air:AirSegment Key="Jcog2B8Q2BKAEkFTAAAAAA==" Group="0" Carrier="AF" Origin="TLS" Destination="ORY" AvailabilityDisplayType="Fare Shop/Optimal Shop" ProviderCode="1G" FlightNumber="6111" DepartureTime="2017-12-29T08:30:00+01:00" ArrivalTime="2017-12-29T09:50:00+01:00" ClassOfService="H" AvailabilitySource=""/>
      </air:AirItinerary>
      <air:AirPricingModifiers InventoryRequestType="DirectAccess" CurrencyType="EUR">
        <air:BrandModifiers ModifierType="FareFamilyDisplay"/>
      </air:AirPricingModifiers>
      <com:SearchPassenger Code="ADT" Age="30" DOB="1987-12-21" BookingTravelerRef="ADT_1"/>
      <com:SearchPassenger Code="INF" Age="1" DOB="2016-12-21" BookingTravelerRef="INF_2"/>
      <air:AirPricingCommand>
        <air:AirSegmentPricingModifiers AirSegmentRef="Jcog2B8Q2BKAEkFTAAAAAA==" FareBasisCode="HWKWFR"/>
      </air:AirPricingCommand>
      <com:FormOfPayment Type="Credit"/>
    </air:AirPriceReq>
  </soapenv:Body>
</soapenv:Envelope>

Response

<?xml version="1.0"?>
<SOAP:Envelope xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/">
  <SOAP:Body>
    <SOAP:Fault>
      <faultcode>Server.System</faultcode>
      <faultstring>AppErrorSeverityLevel/1 : INVALID INPUT</faultstring>
      <detail>
        <common_v42_0:ErrorInfo xmlns:common_v42_0="http://www.travelport.com/schema/common_v42_0">
          <common_v42_0:Code>10</common_v42_0:Code>
          <common_v42_0:Service>SYSTEM</common_v42_0:Service>
          <common_v42_0:Type>System</common_v42_0:Type>
          <common_v42_0:Description>Transaction failure.</common_v42_0:Description>
          <common_v42_0:TransactionId>7B40C7230A07643B8CD8DFC4A9D8DA40</common_v42_0:TransactionId>
          <common_v42_0:TraceId>80461fce-7722-436d-ae2e-ba427e547aa0</common_v42_0:TraceId>
        </common_v42_0:ErrorInfo>
      </detail>
    </SOAP:Fault>
  </SOAP:Body>
</SOAP:Envelope>

Travelport / travelport-uapi-tutorial

AirPriceReq error 10 with Infant ? #453