Use a task's GUID.
Subject of the task (Primary).
Description of up to 4,000 characters.
The related record's GUID. Can belong to any editable system object type.
Primary field of the related record. If you set the objectid field, you MUST set this field as well.
Object number of the object the related record belongs to. If you set the objectid field, you MUST set this field as well.
The GUID of the system user who created the record, can also be set manually. Will be used for permissions.
Priority (Picklist)
Date and time the owner will be reminded of the task.
Date and time the task is scheduled to be completed by.
Status (Picklist)
Type (Picklist)
200