Identifies the customer's unique purchase order or requisition number that authorizes the issuance of this request or supplement.
NOTE 1: The PON may be reused after two years from the due date of the original request.
NOTE 2: The original value must be retained for the life of the ASR request.
USAGE: This field is required.
DATA CHARACTERISTICS: 16 alpha/numeric characters
EXAMPLE: 8 2 4 Z 9