Segment: BAK Beginning Segment for Purchase Order Acknowledgment
Position: 020
Level: Heading
Usage: Mandatory
Max Use: 1
Purpose: To indicate the beginning of the Purchase Order Acknowledgment Transaction Set and transmit identifying numbers and dates
Syntax Notes:
Semantic Notes:
Notes:   Example: 
Data Element Summary 
  Ref. Data
  Des. Element Name Attributes
M BAK01 353 Transaction Set Purpose Code M ID 2/2
  Code identifying purpose of transaction set
  00    Original
M BAK02 587 Acknowledgment Type M ID 2/2
  Code specifying the type of acknowledgment
  AC    Acknowledge - With Detail and Change
  AD    Acknowledge - With Detail, No Change
  AE    Acknowledge - With Exception Detail Only
M BAK03 324 Purchase Order Number M AN 1/22
  Identifying number for Purchase Order assigned by the orderer/purchaser
M BAK04 373 Purchase Order Date M DT 8/8
  Date expressed as CCYYMMDD
    The date assigned by the purchaser to the purchase order.  
  BAK07 367 Contract Number O AN 1/30
  Contract number
    Vendor's Reference Number  
Must Use BAK09 373 Acknowledgment Date O DT 8/8
  Date expressed as CCYYMMDD
    The date assigned by the sender to the acknowledgment.  
855I4010 (004010) November 3, 1999