Diagnosis
You have 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 that areassigned to an assortment.

System Response
When a client-wide follow-up/replacement material relationship iscreated, the system always checks independently of the settings for thefollow-up type whether identical relationships that have been assignedto an assortment already exist.
The system displays this warning message, but still saves thefollow-up/replacement material relationship.