Get sys_id of workflow catalog task

[xiaix]

I need to edit a field on a newly created catalog task, as soon as it's created.  Normally, I would just do task.field = , but the field I need to update doesn't actually sit on the sc_task table, it sits on the sc_request table and I know you can't do the following:

task.request.requested_for = "foobar";
task.request.update();

I read this post: https://community.servicenow.com/community?id=community_question&sys_id=80570369db1cdbc01dcaf3231f96...

but I'm not sure.

So, I did get it to work, but there must be a better way.

Here's a diagrammed way I have it now:

[syedfarhan]

How can we get approval sys_id from Approval User - activity ?