When editing the properties of the set datum tag Annotation Element, the Set Datum Tag dialog box that opens does not contain the References area. Therefore, you cannot change the reference of the set datum tag annotation when editing the properties of the set datum tag annotation element. You can change the placement type and specify a new location for the set datum tag annotation.

You can redefine the reference datum feature to a new placement reference by right-clicking the datum feature on the Model Tree and clicking Edit Definition on the shortcut menu. On redefining the reference datum feature to a new placement reference, the set datum tag Annotation Element fails regeneration. To regenerate the set datum tag Annotation Element, redefine the attachment reference of the set datum tag appropriately.