Rule in workflow task not assigning agent

All,

I have created a rule to determinate the agent for a task.

I have assigned it to a function to be executed,

The function module has the correct input parameters.

and before implementig the logic that determines the agent, I have assigned it to my user as shown below.

But its not working, every time that I create a trip ( with another user ) I do not receive messages in my inbox to approve the trip. I don't know if something is missing or if i have to refresh some buffers.

Thanks and Regards

Jon