Preparations

In IDE:

1. open the core/units/configuration/configuration_event_handler.php file for editing
2. add this code at the end of the \ConfigurationEventHandler::OnBeforeItemValidate method:

if ( $object->GetDBField('VariableName') === 'UseColumnFreezer' ) {
    $object->SetError('VariableValue', 'invalid_format');
}

3. save changes

Part 1

1. login to the Admin Console
2. go to the Configuration → Website → Advanced section
3. type different values for in the 1st and 2nd inputs of the Root Password system setting
4. scroll to the top of the page
5. press the Save toolbar button
6. confirm, that:
   • you're automatically scrolled to the 1st validation error
   • a validation error for the Root Password system setting is shown
7. clear the inputs for the Root Password system setting
8. scroll to the top of the page
9. press the Save toolbar button
10. confirm, that:
    • you're automatically scrolled to the 1st validation error
    • a validation error for the Use Column Freezer system setting is shown

Part 2

• in IDE:
  1. open the core/units/sections/sections_config.php file for editing
  2. change the template of the in-portal:configure_advanced section from the config/config_universal to config/config_general
  3. save changes
• in Admin Console:
  1. go to the Tools → System Tools section
  2. rebuild the section cache
  3. go to the Configuration → Website → Advanced section
  4. confirm that the Select Module Root Section system setting is shown
  5. repeat test from the Part 1 part starting from item 2

Part 3

1. login to the Admin Console
2. go to the Configuration → E-commerce → General section
3. change the Select Module Root Section system setting to any section/category, exception Home → Products
4. save changes
5. go to the Configuration → E-commerce → General section (through the item in the tree to ensure full page reload)
6. confirm that the Select Module Root Section system setting value was properly saved
7. change the Select Module Root Section system setting to Home → Products section/category
8. save changes