A:

1.       In FP6 travel outside Europe does not need prior approval however; it should have been foreseen in the DoW. The expanse must be justified as a project costs as economic, actual and necessary like any other expense

2.       If tuition fee is a “benefit” instead of paying salary (i.e. like grants to PhD students etc) then the cost is part of personnel costs. Locally it may or may not be liable to Income tax, but that is a separate issue which does not affect whether it is eligible for EU