File content conversion in Sender Adapater for multiple occurances

Hi ,

I am mapping from flat file to idoc .

My flat file is a tab demilited

Since the idoc would have structure

like header , lineitem , schedule

in my flat file conversion

i am giving recordset structure

as header,1,lineitem ,,schedule,

since lineitem would be repeated many times

Bt if i give * i need to give a keyfieldname

which would mean that keyfieldname has to appaer in header and schedule .

since in my case my Column values in header , lineitem and schedule are different

how can i do the file conversion in this case

i can doing something like this

header.keyFieldValue ""

schedule.keyFieldValue ""

header.keyFieldInStructure ignore

schedule.keyFieldInStructure ignore

i am not even sure if thats the correct way

Thanks

Amit