Documents & equipment required for international journey

Ive recently been told by another driver that a friend of his got stopped by the red caps and was hit with a fine for 4000euros as he had a copy of the european authorisation. Whether this is urban myth or not i dont know, but if its true, its a absolute disgrace, once again shows that the rad caps are a law unto themselves. (it was a genuine copy of the authorisation not a photocopy) Any 1 else had a problem similar?