AR - INVOICE #                REQUIRED ENTRY

10 Character ALPHANUMERIC field.  The Invoice # gives an identity to each Invoice.
These Invoice Numbers are usually in some sort of Numeric Sequence for control purposes.

You can use part of this field for a note, however some part of this entry should be UNIQUE
to this Customer. Later you will use this Invoice Number to ACCESS this Record to POST
PAYMENT and for Historical Lookup.