Identifies the prefix for the address number of the service address.
USAGE: This field is conditional.
NOTE 1: Optional when the SANO field is populated, otherwise prohibited.
DATA CHARACTERISTICS: 6 alpha/numeric characters
EXAMPLE: 2 5 W
NOTE 1: Where 25W is the address number prefix for the following address example: 25W 450 1/2 SW Camino Ramon Lane NW, Floor 12, Wing 2, Suite 23A.