How to handle <Action S:mustUnderstand="1" WS-Addressing Header in inbound Provider

Hi,

Webmethods exposed a service as webservice .web methods is receiving request from calling system with WS-Addressing Headers
To,Action,ReplyTo.etc. We are getting Error for Action.
As Action Header is having property S:mustUnderstand=1. .So calling system is getting error
xxxxxxxxx.

We are already using handler to capture the header. What we need to do make server understand we have understood the Action tag. or what step we need to do for this in webmethods to parse the request

what specific error does the client receive.

also check “Web Services Developer’s Guide”
section: Service First and WSDL First Provider Web Service Descriptor: Response (Outbound Message) - wsa:Action Detailed Usage