Can't input Business Income on T2125, it's greyed out, can't unselect Professional Income

I opened the form T2125 to enter my business income, filled out the identification section then scrolled down to enter my business income ... but Part 1 - Business Income was 'blued' out and Part 2 - Professional Income was 'X'd' ... and I couldn't delete the X.  Please tell me how to fix this.  Screen print attached.