I read soapAction attribute is optional in WSDL binding, which means it can be omitted or put empty value with double quotes "".
In this case do we must set soapAction in soapMessage? If yes how we can do it in header, assuming we are not using httpservlet as client.
For ex: Assume we omit soapAction from this snippet.
<x1:binding name="ServiceSoapBinding" type="x3:OfferMgmtServicePort">
<x4:binding style="document" transport="http://schemas.xmlsoap.org/soap/http" />
<x4peration soapAction="add" style="document" />