Identifies that the service address location information being provided is a primary location.
VALID ENTRIES:
Y = Primary Location
NOTE 1: Absence of an entry in the PI field assumes that the location is a secondary location.
NOTE 2: Only one PI field entry per request can be identified except when ordering Ring service.
USAGE: This field is conditional.
NOTE 1: Required when the first position of the PRILOC field on the EUSA, RING or ARI Form is “E”.
NOTE 2: Required when the REQTYP on the ASR form is "E" and SEI field on the ASR form is populated.
NOTE 3: Required when the EU field on the ASR Form is “Y”.
NOTE 4: Otherwise prohibited.
DATA CHARACTERISTICS: 1 alpha character
EXAMPLE: Y