Receive an XML with ACTION with mustUnderstand=1

Hi, guys, I need some help, I'm getting an XML from the Matrix application and in the header there's an Action that has the property mustUndertand = 1

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Header>
    <Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://protocolomatrix.matrixsaude.com/RecebeResultado</Action>
  </s:Header>
  <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

No BS Receives but cannot handle the action.