Assigning an Alternative Label to a Functional Location 
Use
A functional location could, for example, have the label BB-03 in a company-wide labeling system. However, in a customer-defined labeling system the same location should have the label RL-999.

You do not rename the functional location label using this method. The master record of the functional location remains unchanged. Using the alternative label, you just create a reference to this master record in an alternative labeling system.
Procedure