How To Disable Products...? Help!

Hello

I'm currently having kittens (hoping for twins) over not being able to deselect certain products, as the aspect ratio won't work on anything other than prints.

I have been advised that the best way is to select 0.00 when it comes to adding my markup, but I get:

OOPS... SOMETHING IS NOT RIGHT
The minimum markup for you print 8 PRICE is $0.01.
The minimum markup for you print 10 PRICE is $0.01.
The minimum markup for you print 12 PRICE is $0.01.
The minimum markup for you print 14 PRICE is $0.01.
The minimum markup for you print 48 PRICE is $0.01.
The minimum markup for you print 60 PRICE is $0.01.
The minimum markup for you print 72 PRICE is $0.01.
The minimum markup for you print 84 PRICE is $0.01.

...etc.

Can anyone suggest ways that I can disable those products I don't or can't sell due to my license.