Should I tick "someone can claim me as dependent" if my mom will be claiming me as dependent other?

I'm not sure if it's new but last year I don't remember there being the ability to claim someone as dependent other. So when I filed my son's tax return I didn't tick the box where they say that someone else is claiming them as a dependent. Then when I filed my tax return, I realized the dependent other category existed so I ticked it and now my returns were rejected. 

So now if I'm going to tick the "dependent other" box on my return do I need to amend my son's to say that "someone can claim me as dependent"?

Thanks!