path: custom/modules/Agreements/

logic_hook.php

<?php

$hook_version = 1; 
$hook_array = Array(); 
// position, file, function 
$hook_array['process_record'] = Array();
$hook_array['after_ui_frame'] = Array();
$hook_array['process_record'][] = Array(1, 'Sum_Each', 'custom/modules/Agreements/sum.php','SumAgreementsHook', 'sumTotalFromEachRow');
$hook_array['after_ui_frame'][] = Array(1, 'Display_Sum', 'custom/modules/Agreements/sum.php','SumAgreementsHook', 'displaySumTotal');