wcml_js_lock_fields_ids

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

function add_js_lock_fields_ids( $ids ){

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

	return $ids;
}