SAP Message C4201 - Subordinate class "&" is locked

Diagnosis
The class you entered is part of a class hierarchy or network. Thesuperior class &v1& is currently locked.
This means that it is not possible to assign values to characteristics.You can display values already assigned, but changes are not allowed.This has to be the case to avoid inconsistencies in the hierarchy ornetwork.

System Response

Procedure
Wait until your colleague has finished working with this part of the
hierarchy.