purchase_request_substate

Purpose

This module extends purchase requests with substate management to enhance workflow control by allowing additional states within main states.

Features

purchase.request: Adds a substate field in the form header with a clickable statusbar widget.
purchase.request: Enforces substates to only be selectable when they match the current main state.
purchase.request: Automatically sets the first available substate when transitioning to a state with defined substates.
purchase.request: Resets the substate to none when moving to states without defined substates.
base.substate.type: Extends substate types to support the purchase.request model.
mail.template: Includes email templates for notifying users of substate changes, such as verification.