Inventory Lines - Use of Stock Input Account, Stock Output Account, Expense Account, Income Account

There are 3 non-required(non-blue)fields wherein Stock Accounts and Income and expense accounts can be set:

Products >Products> Accounting Tab > Purchase Properties
                                               Sales Properties

Products> Configuration > Product Categories > Accounting Properties
                                                                               Accounting Stock Properties

Stock Management > Configuration > Locations > Inventory Account

-When making a purchase order for a product that has no expense account set, it will prop up an error that the purchase order could not continue even if the expense account isn't a required field.

-When the fields in the accounting properties and the accounting stock properties are not filled in, it automatically puts in a default account. (Tested with default data in v5)

-Entry lines made to Stock Journal when a purchase order is made, Credit: Raw Materials Debit: Purchase Account wherein the entries should be, Debit: Raw Materials Credit: Purchase Account. Settings are:
Stock Input Account: Raw Materials
Stock Output Account: Output Account
Expense Account: Purchase Account
Income Account: Sales Account

The heirarchy of the usage of OpenERP of the stock accounts that are set are as follows:

1. Locations > Inventory Account
2. If no Inventory Account set in Locations, Products > Stock Input & Stock Output Account
3. If no Stock Input & Stock Output Account set in Products, Product Categories > Accounting Stock Properties