A collection of error, warning, or information messages that result from a system action. A collection of error, warning, or information messages that result from a system action. If the element is present, it must have either a @value, an @id, or extensions An error, warning, or information message that results from a system action. A collection of error, warning, or information messages that result from a system action. Indicates whether the issue indicates a variation from successful processing. Describes the type of the issue. The system that creates an OperationOutcome SHALL choose the most applicable code from the IssueType value set, and may additional provide its own code for the error in the details element. Additional details about the error. This may be a text description of the error or a system code that identifies the error. Additional diagnostic information about the issue. This element is deprecated because it is XML specific. It is replaced by issue.expression, which is format independent, and simpler to parse. For resource issues, this will be a simple XPath limited to element names, repetition indicators and the default child accessor that identifies one of the elements in the resource that caused this issue to be raised. For HTTP errors, will be "http." + the parameter name. A [simple subset of FHIRPath](fhirpath.html#simple) limited to element names, repetition indicators and the default child accessor that identifies one of the elements in the resource that caused this issue to be raised. Invalid Content Structural Issue Required element missing Element value invalid Validation rule failed Security Problem Login Required Unknown User Session Expired Forbidden Information Suppressed Processing Failure Content not supported Duplicate Multiple Matches Not Found Deleted Content Too Long Invalid Code Unacceptable Extension Operation Too Costly Business Rule Violation Edit Version Conflict Transient Issue Lock Error No Store Available Exception Timeout Incomplete Results Throttled Informational Note A code that describes the type of issue. If the element is present, it must have either a @value, an @id, or extensions Fatal Error Warning Information How the issue affects the success of the action. If the element is present, it must have either a @value, an @id, or extensions