wcml_js_lock_fields_classes

/**
 * Add this code to the functions.php file of your theme.
 */
add_filter( 'wcml_js_lock_fields_classes', 'add_js_lock_fields_classes' );

function add_js_lock_fields_classes( $classes ){

	// Add 2 locked field classes
	$classes[] = '_per_product_pricing_bto';
	$classes[] = '_per_product_shipping_bto';

	return $classes;
}