Understand Web service error messages

Data Web Services 2008/06 returns more meaningful error messages, instead of exceptions that were returned in Data Web Services 2007/08. These error messages belong to one of two levels:

• System level - Represents interruption of network communication or any general problem that are part of service implementation. These errors represent events that are not related to the business logic or data that is being executed.

• Business level - Represents events where service responds to violations in business logic or data.

Each Data Web Service operation is decorated with Fault Contract attributes, such as:

[OperationContract]

[FaultContract(typeof(BusinessFault))]

[FaultContract(typeof(SystemFault))]

Example error messages:

The field '{0}' does not exist.

The location '{0}' is not valid for module '{1}'.

The merge criteria resulted in multiple records being matched.

The merge criteria key field names must be empty if a record ID has been specified.

The merge criteria key field names must be specified if a record ID is not provided.

Related topics

• About Web services

• About Data Web Services 2008/06