Liferay DXP 7.1 with Fix-Pack 15 and Commerce 2.0.7.
Steps to reproduce:
1) Go to the Control Panel -> Configuration -> Custom Fields -> Commerce Product Option Value -> Create new custom field -> Provide a custom field name as 'Hex Value' and type as 'Text field - Indexed'
2) Go to the Commerce -> Products -> Options -> Select any options values(Create new option if you do not have) -> Verify whether it is showing new Option value as 'Hex Value' -> It is showing the new option value.
3) Go to the Commerce -> Products -> Select any product -> Select Options tab -> Select any option values(Add created master option if you have not added) -> Verify whether it is showing new Option value as 'Hex Value' -> It is not showing 'Hex Value' option.
It should show the new custom field 'Commerce Product Option Value' at both levels commerce product option level and master products option level.