Disabling WS-Security Header

How do I disable the ws-security header that is added in raw form for every request. I dont want to use that. I'll use custom header, that I've already added in the xml request. can some one help, pls?

below is sample ws-security header

oapenv:Header><wsse:Security soapenv:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"><wsse:UsernameToken wsu:Id="UsernameToken-63" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"><wsse:Username>salesteam</wsse:Username><wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">bntest123</wsse:Password><wsse:Nonce EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary">tQUuGL2CLCeCI5lmiFXPog==</wsse:Nonce><wsu:Created>2012-02-28T17:00:20.784Z</wsu:Created></wsse:UsernameToken></wsse:Security>