Linking a parent section link straight to child section

I have a parent section titled "Campaigns" with two children sections titled "Rules" and "Results". When the parent section is clicked in the drop down on the right (please forgive the rough prototype) I send the user directly to the first child section because there isn't any content in the parent section landing page.

I have the label and the section indication on the left navigation so I feel they should understand where they have landed. The word "Campaigns" on the left nav would not be clickable. In other sections that parent link would active be if there was content on that page, so there'd be some inconsistency there. But I would indicate whether or not that it's a link with styling.

I don't want to create filler content or put two buttons on that page to have them end up in the same spot.

I'd also rather avoid the dropdown menu within a dropdown menu if I can because of its own usability issues. I could potentially make "campaigns" look more like a header in the dropdown and indicate that "Rules" and "Results" are child categories right below it, but this might look a little weird. Especially with the categories listed out below it (I want to keep the sections listed alphabetically).

Will linking straight to the child section from a parent link create a bad experience and confusion? If so, are there any suggestions to get around this issue? If it's an okay approach, does anyone know of any articles out there on this? I couldn't find any one way or the other but I'd like to have some support when defending this decision.