Diagnosis
When you created or changed a follow-up/replacement materialrelationship, the system detected one or more follow-up/replacementmaterial relationships with the same source material number, the sameassortment assignment, the same follow-up type number, and overlappingvalidity intervals.

System Response
In the follow-up type of a follow-up/replacement material relationship,the Validity flag determines whether a validity period isspecified when a follow-up/replacement material relationship is created.

• If the flag is set, you have to specify a validity period when
you create or change a follow-up/replacement material relationship.
The system checks whether one or more follow-up/replacement materialrelationships exist with the same source material number, the sameassortment assignment, the same follow-up type number, and a validityperiod that overlaps the new or changed follow-up/replacement materialrelationship.

• If the flag is not set, you cannot specify a validity period when
creating or changing a follow-up/replacement material relationship.
The system does not perform a check of overlapping validity periods. Itinternally sets the start of the validity period of afollow-up/replacement material relationship to the current date and theend date December 31, 9999.
If this error message appears, the system does not save thefollow-up/replacement material relationship.

Procedure
Change the validity period of the follow-up/replacement materialrelationship.