Update a custom field in a Deal when a task is created

Hopefully somebody can help me...

I am trying to use a custom function to update a custom field in a Deal when a task is created that is related to that Deal. The function is firing ok because I have sent myself test emails but it is not updating the Deal. The custom field is "Task Created" and I want to set it to a value of "True" (it is a Boolean).

Here is the code I have used. If anybody can help, I would really appreciate it.

taskDetails = zoho.crm.getRecordById("Tasks",taskID.toLong());

semodule = ifnull(taskDetails.get("$se_module"),"");

if(semodule == "Deals")

{

seid = ifnull(taskDetails.get("What_Id"),"").get("id");

RelatedSBOs = zoho.crm.getRecordById("Deals",seid);

mp = Map();

mp.put("Task Created","True");

update = zoho.crm.updateRecord("Deals",seid,mp);

info mp;

info update;

}