The predefined relation has not the predefined ID and cardinality. Probably this issue appeared because relation had been deleted and recreated afterwards.
Applies to all Data Definitions.
Detects problems caused by customer changes.
On fixing this issue automatically, the existing relation will be renamed to Ud_<Relation Techn.Name> and the original relation will be restored. This will probably harm customizings that are using this relation. Please check such customizings after update with highest care.