Dear Emiliano,
The Metrics table on the Summary tab of the Results page shows the same metrics, regardless of the solution mode you choose on the Financial Parameters page.
When you choose the Specify PPA Price option for the PPA Single Owner financial model, you should probably just focus on the "IRR at end of project" value. For the Specify PPA option, SAM sets "Year IRR is achieved" metric to the IRR target year value from the Financial Parameters page, and shows the cumulative IRR for that year as "Internal rate of return (IRR)". That might be useful for some analyses where you want to compare the IRR in a given year to the IRR over the project life.
On the Cash Flow tab of the Results page, you should see a row showing the "After-tax project cumulative IRR (%)." If the IRR target year is set to 20, then SAM will display the value in the Year 20 column from that row in the Metrics table on the Summary tab. Depending on the financial parameters, the cumulative IRR may converge on a single value before the end of the analysis period.
Note that the scroll bar on the Cash Flow tab sometimes does not appear, preventing you from seeing the entire cash flow table. To fix that problem, minimize or resize the SAM window and then maximize it.
Best regards,
Paul.