Diagnosis
The relationship specified has a percentage of over 100%.
The Customizing setting "Maintain Relationship Characteristics" (IMG,Organizational Management -> Basic Settings -> Maintain Relationships/T77AR and T77AV) specifies that this a percentage check is to becarried out for this relationship, in order (depending on the type ofrelationship) to indicate overstaffing.
This setting specifies whether this message is to appear as Information(I), a warning (W) or an error (E).
Personnel Administration transactions:
Integration between Personnel Administration and OrganizationalManagement. The action you have just executed in PersonnelAdministration has caused changes to relationships in OrganizationalManagement, which have triggered this message.

Notes
In EBP/CRM systems, the IMG path mentioned here is not available. Usetransaction SM30 (table maintenance) to change table T77AR.