CobianSoft

The problem is that the event *is executed* which makes it to be successful but the result makes it "wrong"...

Will check this out

Is this about events? Or filters?

Is D a shared drive on some other server perhaps?

Yes, that's why this option exists (in case 2 or more tasks are messing with each other's attributes).
A better way would be to have both destinations in the same task. Then this change is not needed at all.

Check if you get some error in the Event viewer.

As default, yes. But nnot if you choose not to ignore them.