Axis 1.4 - remove mustUnderstand attribute

[borras borraccia]

Hi,
I'm trying to create an axis client to invoke an external webService.
I wrote this code:

SOAPEnvelope envelope = new SOAPEnvelope();
envelope.getHeader().detachNode();		
SOAPHeaderElement el=new SOAPHeaderElement(docH.getDocumentElement());
el.setActor(null);
envelope.addHeader(el);
...

And this is the generated header:

<soapenv:Header xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
 <urn:MyHeader xmlns:urn="urn:blablalba" soapenv:mustUnderstand="0">
...

The server doesn't like the "mustUnderstand" attribute and I don't know how to remove it.
Any help?

Thenk you!