* `Loan`, indicating that the `Entity` is receiving these funds as a loan

  that is expected to be paid back.

#### Program Tag

The `Program` tag is used primarily to track program activity for `Income:`

and `Expenses:` accounts.  This allows for knowing what particular initiative

initiated the income (e.g., a specific fundraising campaign) and/or what

particular program activity an expense is toward (e.g., funding travel to

some specific conference).

The Program tag is always a string with the same format as a Ledger CLI

account (primarily for use with Ledger CLI's `--pivot` and `--group-by`,

[as described later](#testing-program-success)).

### Account Type Documentation Requirements

Each account type has different documentation requirements.  Based on the

type of the account, it requires a different set of tags.

When Ledger CLI's `--pedantic` option is used, these rules are enforced by

ledger itself via the configurations found in `config-tags.ledger` and

`config-accounts.ledger`.

#### Expense Account Documentation

Each `Expenses:` account entry must be tagged with the following tags:

* One of: [`Invoice:`](#invoice-tag) [`Receipt:`](#receipt-tag), or

  [`Statement`](#statement-tag).  (The only exception to this rule: an entry

  does not need an `Invoice:`, `Receipt`, nor a `Statement` tag if the

  [payee was never charged](#never-charged-payee).)

* A [`Program:`](#program-tag) tag.

#### NEVER CHARGED Payee

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

gave a credit card number to charge something and the charge never came

through — but it turns out the charge never happened.

The recommended way to resolve this problem in the system is to just delete

the entry entirely from the Ledger file, and allow the VCS to log the fact

that the charge was expected, but the vendor never billed the credit card.

The reason the `NEVER CHARGED` payee text was added was to handle the