Thank you @Enrico Parisi . It helps us. Thank you a lot.
 

Thank you @Luis Angel Pérez Ramos for your reply, let's see:

When we click on the magnyfying glass of Llamadas:

We see all the 4 <call> checked.

We have removed the timeout:

And it behaves like this:

It does not wait, for the 4 calls ^

Could you help us?

Thanks @Mike.W for your reply and help.

We have written the timeout as 30 and as "30" and in both cases it behaves wrong. It justs receives the first <call> response and it continues the BPL execution flow, without waiting for the other 3 replies:

Being the setting as "30":

And behaves similar with a timeout of 30:

30:

We do not know why.

Thanks for your help.