How to retrieve the long texts from purchase Info record (ME13)

Hi,

How do I retrieve the long texts data from the tab, Texts of the Purchase Info record(ME13). I want to retrieve the current long texts data(long text1, long text2 long text3, long text4) for a given purchase info record. These long texts points to the structure BRM06I.

So, now how do I fetch the data from the structure BRM06I. Is there any function module for the same..

Thanks.