Facebook Open graph warning

In Open Graph Object Debugger there are several errors, when I display a product page:

Warnings That Should Be Fixed
Extraneous Property Objects of this type do not allow properties named ‘og:price:amount’.
Extraneous Property Objects of this type do not allow properties named ‘og:price:currency’.

I think that the <meta property=”og:type” content=”article” /> should change to <meta property=”og:type” content=”product” />. I didn’t find where to do that.