Hello everyone, 
today I had the reply from the national agency (NA) regarding travelling from a different country from the one of the group.
It could be done but it should be explained in order to be considered by the NA.

This the official reply from the NA.
"Normally it would be advisable for them to travel together, from Greece, however, if duly motivated, we can evaluate the request: you must explain why the participant is in Germany, must be there for a short time and must not be there for projects for which they is receiving other financing already.

So, every participant that will do that has to provide me a written statement explaing the reason.

Cheers

PS: Italian NA seems not very flexible...

Federico Venturini
Ph.D. in Human Geography
University of Udine

federicoventurini.academia.edu
twitter.com/Federic20976817