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Multiple unique level 2 classifications are being used within the article group

 
 
Error:
Multiple unique level 2 classifications are being used within the article group.
 
Explanation:
An article group is classified in its entirety in the same classification layer. It is therefore not possible to classify an article from the same group in a different classification level. This is a classification at different places in the second layer of the classification.
 
Solution:
Determine how this group should be classified and classify the whole group in the same classification.