Hi Carlos,
That's because the transaction is set to the default page. What you can do is disable the default page on the transaction as well.
Here is a few suggestions as well.
Right now my sales folder opens op a service map of the entire folder
This is because it is set as a service map
However when i click the sales order processing nothing happens, this is because this isn't a service map and there is no default page.
But if i mark the sales Document Worklist as the default page, then i can click the Sales order Processing in the service map and it will open up that powerlist
I hope this helps.