# Error Warning Types (EWT)

<table><thead><tr><th width="101">Code</th><th width="238">Name</th><th>Reason</th></tr></thead><tbody><tr><td>1</td><td>Unknown</td><td>Indicates an unknown error.</td></tr><tr><td>2</td><td>No implementation</td><td>Indicates that the target business system has no implementation for the intended request.</td></tr><tr><td>3</td><td>Biz rule</td><td>Indicates that the XML message has passed a low-level validation check, but that the business rules for the request message were not met.</td></tr><tr><td>4</td><td>Authentication</td><td>Indicates the message lacks adequate security credentials.</td></tr><tr><td>5</td><td>Authentication timeout</td><td>Indicates that the security credentials in the message have expired.</td></tr><tr><td>6</td><td>Authorization</td><td>Indicates the message lacks adequate security credentials.</td></tr><tr><td>7</td><td>Protocol violation</td><td>Indicates that a request was sent within a message exchange that does not align to the message.</td></tr><tr><td>8</td><td>Transaction model</td><td>Indicates that the target business system does not support the intended transaction-oriented operation.</td></tr><tr><td>9</td><td>Authentical model</td><td>Indicates the type of authentication requested is not recognized.</td></tr><tr><td>10</td><td>Required field missing</td><td>Indicates that an element or attribute that is required in by the schema (or required by agreement between trading partners) is missing from the message.</td></tr><tr><td>11</td><td>Advisory</td><td></td></tr><tr><td>12</td><td>Processing exception</td><td>Indicates that during processing of the request that a not further defined exception occurred.</td></tr><tr><td>13</td><td>Application error</td><td>Indicates that an involved backend application returned an error or warning, which is passed back in the response message.</td></tr></tbody></table>


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