* a confirmation document showing transfer of funds between two bank

  accounts.

* A pay advice document generated upon payment of an invoice.

#### Invoice Tag

The `Invoice:` tag refers to an actual invoice, either generated by the

organization or received by the organization.  Typically, this is a document

that is a request for payment, rather than documenting an actual payment that

has occurred.  The value of the `Invoice:` tag is always a valid pathname in

the repository to the document.

Some examples of appropriate uses of the `Invoice:` tag are:

* an actual invoice as sent by a vendor to the organization.

* a request for payment sent by the organization to someone else.

* a reimbursement request submitted by an employee, contractor, or volunteer

  for expenses they've already incurred and would like the organization to

  reimburse (e.g., an expense report, requesting for reimbursement of travel

  expenses).

### Expense Account Documentation

Each Expense account entries need to be tagged with an `Invoice`, `Receipt`,

or `Statement` tag.  The value of the tag is a relative path name of a file

elsewhere in the same repository that documents the specific expense.  For

example, an entry like this:

     2012-02-05 Office Supply Galore - Online Order

         Expense:Main Org:Office Supplies      $35.00

             ;Receipt: accounts/documentation/org/receipts/2012-02-05_office-supply-galore.txt

         Liabilities:Credit Card:Visa         -$35.00

shows that a purchase was made at Office Supply Galore's online store for

$35.00, and the file `accounts/documentation/org/receipts/2012-02-05_office-supply-galore.txt`

contains the receipt from that purchase.

#### payee with "NEVER CHARGED"

The only exception to the standard tagging requirement is when the payee has

been modified to indicate that the expense was `NEVER CHARGED`.  This is an

historical special-case.  The solution was originally design for the

following scenario:

Suppose an expense was expected — for example, a situation where you