Hi Ashish - I think it's defaulted to 1.1.
But are you able to get the namespace as 1.2 when you download the wsdl from service interface in ESR?
If so then try publishing it into service registry from ESR itself rather than doing it from ID.
(Tools -> publish service interfaces) and see if that works for you..
Reference : http://help.sap.com/saphelp_nw73/helpdata/en/4a/ac62addabb000ae10000000a42189c/frameset.htm
You should have the role "SERVICES_REGISTRY_READ_WRITE" to do that.
