Identifies the reference number associated to the level of service mapping configuration being requested.
NOTE 1: The LREF on this form must match the LREF on the EVC form where an error has been identified.
VALID ENTRIES:
1-5
USAGE: This field is conditional.
NOTE 1: Required when the UREF field is populated and an error has been identified at the LOS mapping level, otherwise prohibited.
DATA CHARACTERISTICS: 1 numeric character
EXAMPLE: 1