Create a new Activity

Outlines the parameters and data fields used when creating a new Activity

For a firm with mandatory LEDES billing enabled, a billable entry on a Matter whose require_utbms_codes is true must carry UTBMS codes:

• TimeEntry — activity_description[utbms_activity_id] and activity_description[utbms_task_id].
• ExpenseEntry, HardCostEntry, and SoftCostEntry — utbms_expense[id].

An entry that lacks them returns 422 with error.errors.activity_description or error.errors.utbms_expense set.

Exceptions: non_billable entries, flat-rate entries or matters, and contingency matters.