Configurator Item Alias, should this rule works?

Hi to All

I'm trying to use configurator item alias, and I have a doubt about a rule, I don't know if this should work as I expect or not

First the setup:

I have a Parent item call it PARENT

this parent have 3 segments:

10 Alias to insert no default value

20 Copy to Alias 1  default value = 20

30 Copy to Alias 2 default value = 30

if I place the answer 1 in 10 I want to insert child item CHILD with ALIAS CHILD1

If I place the answer 2 in 20 I want to insert child item CHILD with ALIAS CHILD2

this works with
thess P RULE

IF 10 EQ 1