Valid Segment Types
- STR - constant string (pre-supplied value)
 - DTE - Date/Time component of the current system date
 - SEQ - Sequence number
 - HDR - Receipt table (Header) lookup value
 - DET - Receipt Detail table lookup value
 - POH - Purchase Order Header table lookup value
 - STO - Storer (Owner) table lookup value
 - SKU - SKU (Item) table lookup value