SD Rebel
Spends too much time on here
How would that void your warranty? I don't think you are under any obligation to provide proof that you changed your oil at any particular intervals.
As mentioned, it is stated in both the main manual and service manual not to go beyond 1 year regardless of what the maintenance computer states. The manufacturer can outline minimum required maintenance to stay within the powertrain warranty, and for RAM (and many others) that is 1 year or 10,000 miles, whichever comes first.
If you get a powertrain warranty claim and DIY your service, they may ask for your parts/materials receipts and dates/times you did the service. If you cannot prove you did the service on time, they can refuse your claim.
In the end, it's up to the dealership on how they want to proceed. But it's highly recommended you keep your receipts of the oil & filter you use and keep a log of when you did your service.