Oracle Web Services On Demand Guide > Web Services On Demand API Calls > Web Services v1.0 API Calls >

User Keys

The objects (both child and parent level) provided in the input arguments for the Web Services v1.0 methods must provide data in at least one of the user keys for the given object. You use the user key information to uniquely identify records. If no user key values are provided, or if there is a conflict with the user keys of an existing record, the method fails, and a SOAP error is thrown by the API.