Predefined types for line item change state reason.
Values:
LINE_ITEM_CHANGE_STATE_REASON_TYPE_UNSPECIFIED (0):
Default value, indicating there's no
predefined type for change state reason.
LINE_ITEM_CHANGE_STATE_REASON_TYPE_EXPIRED (1):
Change is in current state due to term
expiration.
LINE_ITEM_CHANGE_STATE_REASON_TYPE_USER_CANCELLED (2):
Change is in current state due to
user-initiated cancellation.
LINE_ITEM_CHANGE_STATE_REASON_TYPE_SYSTEM_CANCELLED (3):
Change is in current state due to
system-initiated cancellation.
