Hello Jean-Jacques

You're welcome, glad I could help.

This is going to be fixed with the next update. DFSKarma, since the last response was private, here's how this was fixed for Jean-Jacques:

Please access ..wp-content/plugins/wdt-master-detail/wdt-master-detail.php and around line 621, you'll see this code:

/**
     * Insert Modal templates
     * @param $wpDataTable \WPDataTable
     */
    public static function insertModal($wpDataTable)
    {
        if (isset($wpDataTable->masterDetail) && $wpDataTable->masterDetail) {
            include WDT_MD_TEMPLATE_PATH . 'modal.inc.php';
            include WDT_MD_TEMPLATE_PATH . 'md_modal.inc.php';
        }
    }

Replace it all with this:

/**
     * Insert Modal templates
     * @param $wpDataTable \WPDataTable
     */
    public static function insertModal($wpDataTable)
    {
        if (isset($wpDataTable->masterDetail) && $wpDataTable->masterDetail && is_admin()) {
            include WDT_MD_TEMPLATE_PATH . 'modal.inc.php';
            include WDT_MD_TEMPLATE_PATH . 'md_modal.inc.php';
        } else if (isset($wpDataTable->masterDetail) && $wpDataTable->masterDetail){
            include WDT_MD_TEMPLATE_PATH . 'md_modal.inc.php';
        }
    }
    
    /**
     * Insert Template Modal
     */
    public static function insertTemplateModal()
    {
        include WDT_MD_TEMPLATE_PATH . 'modal.inc.php';
    }

and then go to line 95 of the same file. There, add a new row, and paste this:

// Add custom modal in DOM
        add_action('wpdatatables_add_custom_template_modal', array('wdtMasterDetail\Plugin', 'insertTemplateModal'), 10, 1);

It should work. If you are not comfortable with doing this, please reply to your private ticket with the log-in credentials for your website, and I'll gladly implement it for you.