Load file based on line number in sqlldr

I am trying to load header and detail records from a file. The only way I know the difference between the header and the detail records is the line number. The first line is always the header and the other lines are detail records. How can I specify the line number of a file when doing a conditional load? I would like to do something like: LOAD DATA APPEND INTO TABLE x WHEN [line_number] = 1 ([mapping for header line]) WHEN [line_number] > 1 ([mapping for detail lines]) The only reason I ask is b/c I take the primary key from the header record in the database and insert it into each detail record. That is a sequence that doesn't get populated until the insert into the header table. I have to load the header/detail in the same transaction because I can't call currval on the sequence until I call nextval - which is only called in the header insert. Is there a way for me to do this?