Using TT2017 to create an amended 2017 return, the original AGI listed does not match what I filed. How to fix?

[Critter]

Before you start the amendment process you MUST have the return set as it was when you originally filed.   If you made any changes to the tax file prior to starting the amendment process then you must fix them first ...   https://ttlc.intuit.com/community/amending/help/how-do-i-cancel-or-undo-an-amended-return-in-the-tur...