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What does Improper Words error mean?
eBay employs a filter to avoid listing in certain areas. For security reasons, we cannot disclose exactly what we are filtering on. One common block is on the word "test". In many categories, the usage of "test" in title or description has been blocked. A notable exception would be the test category:14111. Please note that not all filters are in place in the Sandbox.
If you are having difficulty getting an AddItem, ReviseItem or RelistItem through because of this error and cannot determine the reason, please contact Developer Support for assistance: