Read_text function for material master PO text

Hi,

I found this tutorial to use read_text function to display texts:

http://abaplovers.blogspot.it/2008/02/function-modules-create-text-and-read.html

Now my problem is to display the text of the material master view "Purchase order text"

When I execute the function by SE37 I can see the following:

CLIENT

ID

LANGUAGE

NAME

OBJECT

ARCHIVE_HANDLE

LOCAL_CAT

LINES

Don't know what values should I have to enter for the field in "bold" format.

Thanks

Regards