Fair warning as of right now in 600 you can no longer view child tables in change log. They are still created but not viewable from the UI.
This is directly thanks to @josecgomez opening a case that they only used key1 previously for comparison which for certain screens would load WAY too much data. However they did as he suggests and added key2 to the filter, well key2 is tilde separated and that would work fine, but it doesn’t appear that the UI and BO were updated to pass they secondary keys along. All that is passed along is the sysrow for the primary head record which tells the backend nothing about the key2 records we need.