SAP Message UCFE029 - Hierarchy of characteristic &1 has changed

Diagnosis
The hierarchy nodes you selected for displaying characteristic &v1& nolonger exist.

System Response
The selected hierarchy nodes cannot be displayed when the layout isexecuted.

Procedure
Switch to change mode (if you are not already there).
Double-click the data-driven structure that contains characteristic &v1&
.
Choose Change to edit the hierarchy.
Double-click the desired nodes and choose OK.
Save the layout.