zentao/extension/ipd/workflowhook/config.php

<?php
$config->workflowhook->operatorList['equal']    = '=';
$config->workflowhook->operatorList['notequal'] = '!=';
$config->workflowhook->operatorList['gt']       = '>';
$config->workflowhook->operatorList['ge']       = '>=';
$config->workflowhook->operatorList['lt']       = '<';
$config->workflowhook->operatorList['le']       = '<=';