Diagnosis
You created a follow-up/replacement material relationship that is notassigned to an assortment, and is therefore valid client-wide.
However, one or more follow-up/replacement material relationshipsalready exist for the same original material, the samefollow-up/replacement material, and the same follow-up type - and theyare assigned to an assortment.

System Response
Independent of the settings for the follow-up type, whenever afollow-up/replacement material relationship that is valid client-wide iscreated, the system always checks whether identical relationshipsalready exist that are assigned to an assortment.
The system displays this warning message, but saves thefollow-up/replacement material relationship.