Pilot's who fly internationally are required to follow the laws of each country in which they are flying (just as a car driver must drive on the left, or right hand side). It is thus incumbent on international pilots (and you may one day grow up to be one ) to read the "ICAO differences" section for each country in which they operate ...
Sure enough, in
GEN 1.7, that's what it says. But wouldn't you expect such a limitation to be mentioned in
ENR 1.5 — HOLDING, APPROACH AND DEPARTURE PROCEDURES? I think GEN 1.7 is intended to be informational, not the primary source of procedural design limitations.