我终于解决了。
只需转到模块/产品/模型中的Record.php并在第327行修改为

$query = 'SELECT label, crmid, setype, createdtime FROM vtiger_crmentity INNER JOIN vtiger_products ON 
                            vtiger_products.productid = vtiger_crmentity.crmid WHERE (vtiger_products.productname LIKE ? OR vtiger_products.productcode LIKE ?)  AND vtiger_crmentity.deleted = 0 
                            AND vtiger_products.discontinued = 1 AND setype = ?';
                            $params[] = "%$searchKey%";

字符串