Thanks to all for your time. Anyway, I´ve tried your proposals (see attachement), taking out the *.txt predefined value, even I get out from the Event Structure the functions, but I can´t get the result expected.
So, answering your questions: I want to store only the selection done, I´m conscient that I can´t store the values (the only point is that in this aplication they coincide by chance, but this doesn´t matter).
I only want to store the selection, to reproduce it again in a future test (it could be that some channels are giving problems and the tester want to load always the same, so have no sense to go over the list all the time).
I really don´t know what is going on, I´ve used this function several times without problems... Also I´m not sure if the data file generated is correct, some letters are appearing.
SOmebody knows about that?