Business Rule returns an array

Hi,

I have an BR that makes the same that the following query:

   select id_integrator
   from integratorBD
   where id_Function like Schema.Id_Function

This query returns 2 ints (10 and 20 for example)

But the schema that results from BR only shows one id_integrator (the last one).

Input Schema :

<input>
<id_function>3</id_function>
<id_integrator></id_integrator>
</input>

Output Schema (result from a test to the BR):

<input>
<id_function>3</id_function>
<id_integrator>20</id_integrator>
</input>

Output schema I was expecting:

<input>
<id_function>3</id_function>
<id_integrator>10</id_integrator>
<id_integrator>20</id_integrator>
</input>

And yes id_integrator can occurs more that one time.

Business Rules only return one result? Is this the behavior by default? Theres any way you guys recommend me to obtain the result with the 2 values output?

Thanks