Multiple unique manufacturer GLNs...

 
 
Error:
Multiple unique manufacturer GLN codes are being used within the article group.
 
Explanation:
Articles are merged into article groups within the database. The manufacturer-GLN is a unique identification for a particular supplier. Within an article group, articles from different suppliers cannot occur.
 
Solution:
Make sure that the articles are grouped per supplier or adjust the incorrect manufacturer GLNs so that there is only one unique manufacturer GLN per article group.
You can check or request GTINs/GLNs at GS1.