It's in NI 17/2004, released today 20/12.
My specific problem? I simply see it as another change with possible adverse safety implications and no obvious benefits. Rather like NAS in that regard. When Flight Number callsigns were introduced I was vocal in my opposition for the same reason of potential confusion, a stance which I see justified on a regular basis. But like the ludicrous state of the readability of our Notams, that was more or less forced for reasons of computer compatibility, and had definite advantages for at least some parts of the system.
This time I see no possible benefit. Do you? Does anybody?
Edited after reading the AIC to accept the problem of the electronic databases. I'll have a think about that while I ponder whether changing the properties of the database would have made more sense. If I come to the conclusion I am wrong I will delete the thread, which all concerned may take as an apology.