If relation was renamed with new product version and a custom relation with the same name already exists in database, the custom relation needs to be renamed.
Applies to all Data Definitions.
Detects problems caused by product changes.
On fixing this issue automatically, the existing <Relation> will be renamed to <Ud_RelationTechn.Name>. This will probably harm customizings that are using this <Relation>. Please check such customizings after update with highest care.