pewc_hidden_group_types_in_order.php

<?php
/**
 * Prevent some field types from being displayed in order data
 */
function prefix_hidden_group_types_in_order( $group_types ) {
	$group_types = array( 'calculation' );
	return $group_types;
}
add_filter( 'pewc_hidden_group_types_in_order', 'prefix_hidden_group_types_in_order' );