Types that use ErrorSeverity:
| Value | Description | Which calls use this value * |
| Error | The request that triggered the error was not processed successfully. When a serious application-level error occurs, the error is returned instead of the business data. | getMostWatchedItems, getRelatedCategoryItems, getSimilarItems, getTopSellingProducts, getVersion |
| Warning | The request was processed successfully, but something occurred that may affect your application or the user. For example, eBay may have changed a value the user sent in. In this case, eBay returns a normal, successful response and also returns the warning. | getMostWatchedItems, getRelatedCategoryItems, getSimilarItems, getTopSellingProducts, getVersion |
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