Problem using Groovy scripts in HCI

I have two flows in HCI were I am planning to use Groovy. The groovy scripts works as expected when used in a Groovy console but when using it inside HCI I cannot get it to work.

Is there any limiotations when handeling XML in groovy scripts or am I missing something that I need to include?

Here is the Groovyscript in an test console: Groovy web console - test_groovy_hci

It returns 3 as expected if I run this in Console but in HCI I get 0 no matter what iDoc I use.