When the status of the system at a digital location changes, e.g. from test to production, a new GLN should be assigned.
It is important that trading partners are able to distinguish communications that are meant for the production and testing environment of the system. This distinction can be accomplished by using a different GLN or by adding a test flag in the message (allowing to use the same GLN for test and production environments).
Another way to state this rule is: Separate GLNs should be assigned to the various environments of a system.