ADD Form Validation With Custom Message

It will be done by one step only! Lets do this,

1. Add a reference to the JavaScript file which will be needed for event binding.

Path: custom/modules/<desired_module>/metadata/editviewdefs.php

<?php

$viewdefs['<desired_module>']['EditView']['templateMeta']['includes'] =
    array (
        array (
        'file' => 'custom/modules/<desired_module>/js/editview.js',
        ),
    );
?>

2. Add the JavaScript file you want to include into the location you referenced above(custom/modules/<desired_module>/js/editview.js).

3. Write following code in editview.js file.

add_error_style('form name', 'field name', 'your message');

For Example :
add_error_style('EditView', 'replan_start_date', 'Replan Date should not be older than Booking Date');

4. Quick Repair, then hard refresh your browser. All Done !

5. Done! Refresh the page and start testing.

Note :

1. Read the comments in code carefully and replace the variables as asked.
2. Here, <desired_module> means the module name you see in the URL, for example, Contacts, Leads, Accounts, etc.
3. You may find the field names and its labels in Admin > Studio > <Your_module> > Fields > <Choose correct field> > Take Field Name and System Label.

Hope you find this blog post helpful.

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Thank you.