Dani - I don't think the issue is actually converting from 73/A32 to the widebody. The difference is in the TYPE OF OPERATION. There is a vast difference between flying on short haul narrowbody ops and LH ops. Management factors, from a tech crew p.o.v, are very different. Having done both types of ops, they are each demanding in their own way. They are, however, chalk and cheese. Some skill sets transfer, but new ones need to be aquired, and others 'unlearned.' With appropriate training , mentoring etc the transition is quite easily achieved, BUT maybe the airline doesn't have the resources to supply that, hence the requirement.