Hi,
i'm trying to understand how planning with a start-start dependency works ..

User guide says :

Start-StartThe successor can not begin before the beginning of the predecessor. Anyway, the successor can begin after the beginning of the predecessor.

So while making a start-start dependency between tasks A an B, B should not start before A.

But this is not happening 

I tried other schemes (end-start and end-end) successfully.. but no way with start-start
Planning mode on task B set to "As soon as possible" or "Fixed duration" does not change anything.

Does anyone kow why and how to fix it ? 

Thanks Juan