KP06, Long Text for Line Items

I have to upload long text from flat file to transaction KP06 usind BDC. I need to use SAVE_TEXT but i need to know the parameters i need to pass like

TextObject, Name, Text Id,LINES etc for the specific transaction code KP06.

And whether i need to pass the long text obtained by flat file to the LINES in TABLES TAB of the FM.