how to use ffIterator in convertToValues() service.

Hello All,

I am using following flat file schema:-

(top level record) occurance is once
<gl_acc> (sub record) occurance is multiple times
(field in subrecord)
(field in subrecord)
(field in subrecord)
(field in subrecord)
(field in subrecord)
(composite record)
(field in composite record)
(field in composite record)
(another sub record under )
(field under header recoed)
(field under header recoed)

I have the above mentioned flat file schema.
i want to process it by ffIterator. So plz can anyone tell me that how i can do this. How should i use convertToValues() service?

Plz reply soon.

Thanks and Regards
sunny</GL_Acc>