WCF wsHTTP adapter: How to control WS-A elements, attributes.

Hello,
we have a third party soap web service that we invoke using Biztalk BasicHTTP adapter.
This wasn't working.
That's when we were told the web service is a Soap1.2 endpoint.
So we have changed the adapter to wcf-wsHTTP adapter. This still doesn't work!!
we get an error like: Must Understand check failed for header
http://www.w3.org/2005/08/addressing : To
I traced the outgoing call from the adapter via Fiddler.
I see this:
<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing">
<s:Header>
  <a:MessageID>urn:uuid:637ec5d5-f7c3-</a:MessageID>
  <ActivityId CorrelationId="b56a4554-c373-4479" xmlns="00000000-0000-0000-0000-000000000000</ActivityId">http://schemas.microsoft.com/2004/09/ServiceModel/Diagnostics">00000000-0000-0000-0000-000000000000</ActivityId>
  <a:ReplyTo>
           <a:Address>http://www.w3.org/2005/08/addressing/anonymous</a:Address>
  </a:ReplyTo>
  <a:To s:mustUnderstand="1">https://xxx.xxx/xx</a:To>
if i change the mustUnderstand attribute to 0 in the To element, the web service returns
the right response. This was tested using Fiddler.
I understand the adapter is adding the headers like To,ReplyTo etc. but not sure
why. How do i disable them getting generated? or How can i set the mustUnderstand to 0?
Any suggestions please?
thanks
MS

Hi,
Refer the SOAP Header Action mustUnderstand Exception.
Add the addressing annotation to the Web Service class @Addressing(enabled=true, required=true)
Change namespaces in the <Envelope> tag from:
<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing">
to
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" xmlns:a="http://www.w3.org/2005/08/addressing">
Both SOAP 1.1 and SOAP 1.2 specifications enable you to use mustUnderstand attributes with SOAP headers. Not handling these headers properly is a common concern during Web service
interactions.
Refer: Understand the Famous "Did not
understand MustUnderstand header(s)"Error
Rachit
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