EViews.com

EViews doesn't give an error for d(y,0)or dlog(y,0). Instead of it, it gives results for d(y,1) or dlog(y,1).
For d(y,-1) or dlog(y,-1) error message is "Illegal difference or DLOG specification".
For d(y,0) or dlog(y,0) message should be the same, or there should be results for y without differencing.

We've fixed this one in the EViews 8 source. It will show up in an upcoming update.