What does "Parent ASIN detected, some data may not be available. Try selecting a variation" mean?

When you see the message "Parent ASIN detected, some data may not be available. Try selecting a variation," this indicates the ASIN of the current product page you are on will not return any of the averages historical data from Keepa for us to display. We suggest you select a child (also known as the variation) ASIN to see historical data.