Own article GTIN is not unique...

 
 
Error:
Own article GTIN {0} is not unique; it is already used (in the existing assortment) at article {1}.
 
Explanation:
The own GTIN is not unique. The import file contains an article with a GTIN, which already appears with another article in the existing assortment. This other article does NOT appear in the import file, but it does appear in the EZ-base data.
 
Solution:
Each article must have a unique GTIN. Check the GTIN number mentioned and see to which article the number belongs. Correct this number in the import file or in the database using EZ-catalog.
You can check or request GTINs/GLNs at GS1.