ORDERS IDOC - Segment E1TXTH1 and E1TXTP1

These segmenst are under E1EDPAD under E1EDP01 in ORDERS05. Looks like these are for Item texts but the standard FM 'IDOC_INPUT_ORDERS' for creating an inbound Sales Order does not even look at these segments ?

Can anyone advise me on how to bring the Item Level Text using the above segments and the Function Module ?

Thanks.