Axis2-1.3 Java-MustUnderstand Attribute to "1"

Hi Everyone,

              I am using Axis2-1.3 and using header from   schemas.xmlsoap.org/soap/envelope/ 

         and my mustUnderstand Attribute is defined like this in my xsd

                                <xs:attribute ref="SOAP-ENV:mustUnderstand" use="required"/>

           I want to set the value to mustUnderstand="1" but its always coming as mustUnderstand="0". Axis is some where setting it to "0". But I am unable to locate it. Any help will be appreciated. Thanks alot