<li>custnum - <a href="#cust_main">customer</a>
<li>_date
<li>charged - amount of this invoice
- <li>owed - amount still outstanding on this invoice
<li>printed - how many times this invoice has been printed automatically
</ul>
<li><a name="cust_bill_pkg">cust_bill_pkg</a> - Invoice line items
<li>crednum - primary key
<li>custnum - <a href="#cust_main">customer</a>
<li>amount - amount credited
- <li>credited - amount still outstanding (not yet refunded) on this credit
<li>_date
<li>otaker - order taker
<li>reason