How to use save handlers

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6

No, if you use simple validation like this:

<?php

$dictionary['Account']['fields']['annual_revenue'] = array(
    'name' => 'annual_revenue',
    'vname' => 'LBL_ANNUAL_REVENUE',
    'type' => 'varchar',
    'len' => 100,
    'comment' => 'Annual revenue for this company',
    'merge_filter' => 'enabled',
    'logic' => [
        'required' => [
            'key' => 'required',
            'modes' => ['edit', 'create'],
            'params' => [
                'fieldDependencies' => [
                    'employees'
                ],
                'activeOnFields' => [
                    'employees' => [
                        '10-50'
                    ],
                ],
            ],
        ]
    ],
);

https://docs.suitecrm.com/8.x/developer/extensions/frontend/logic/field-logic/fe-extensions-required-logic/#_required_logic

Yes if you need more complex validation: