"Change to heading from any other Heading or A regional value content of not less than 40 percent of the FOB value of the good .
Described how the C/O : CTH or RVC 40%"
CTH means HS CODE of original parts materials and HS CODE of completed product should be different, both HS CODE numbers are accredited as place of origin.
RVC means original materials to make a completed product are how much added-value creates comparing with product market price.