If you're experiencing issues while searching for a custom object in the "Select Source Object" picklist on "Map parent records from Source to Destination org" page, ensure that the "Allow Search" checkbox is enabled for that custom object. Follow the steps below:
- Navigate to the Setup menu and select "Object Manager"
- Use the search bar to find the custom object you want to search for.
- Click on the custom object to open its details page.
- Click on the "Edit" button.
- Scroll to the bottom of the page to find the "Allow Search" checkbox. If it is unchecked, enable it.
- Click on the "Save" button to apply your changes.
- With this setting enabled, you should now be able to search for the custom object in the "Select Source Object" picklist on "Map parent records from Source to Destination org" page
