Cannot use new content type

I tried setting up a new product type ... but it would not show up on Webform.

I went to the Webform content type and set it for "Optional" to be a product, and I checked the box for the new product type. Still, the new product type would not show up as an option if I tried to create a new Webform.

I checked the setttings for the new product type; Webform is checked under "Content type."

Any suggestions?