Nicolas,
I guess anything being changed at the global level, you need to exercise a bit of caution. In this case you need to make there are no programs that are currently executing the object you are transporting and this is a normal procedure.
For example you are transporting some changes to an interface you need to make sure that the interface is not running until the transport is moved completely.
Also it is always a better practice not to declare/work with global data unless absolutely required.
V.