If the SOAP message has an empty SOAP action, does not contain a SOAP action, or the SOAP action value cannot be resolved (i.e., no operation in the binder has the specified SOAP action value),
Integration Server searches the binder for an operation with no defined SOAP action value or an empty SOAP action. If the binder contains a single operation that does not have a SOAP action value,
Integration Server executes the IS service that corresponds to this operation. If the binder contains multiple operations without an assigned SOAP action value,
Integration Server treats the absent SOAP action values as duplicate SOAP action values. For information about how
Integration Server determines which operation to invoke when there are duplicate SOAP action values in a binder, see
Duplicate SOAP Action.
If, after searching for the fully qualified name of the first element in the SOAP body, Integration Server cannot determine which operation to invoke, Integration Server returns a SOAP fault to the web service client.