Table to read PO Header text and item text

    CALL FUNCTION 'READ_TEXT'

      EXPORTING

        CLIENT                  = (Client ID)

        ID                      = (Text ID)

        LANGUAGE                = (Language)

        NAME                    = (PO Number)

        OBJECT                  = 'EKKO' for Header & EKPO for Item

      TABLES

        LINES                   = (Internal Table of type tlines)

      EXCEPTIONS

        ID                      = 1

        LANGUAGE                = 2

        NAME                    = 3

        NOT_FOUND               = 4

        OBJECT                  = 5

        REFERENCE_CHECK         = 6

        WRONG_ACCESS_TO_ARCHIVE = 7

        OTHERS                  = 8.

 

 

If you read directly from the table then for getting HEADER TEXT it is is STXH & item text STXL.

 

Better would be to use Function Module READ_TEXT

 

    CALL FUNCTION 'READ_TEXT'

      EXPORTING

        CLIENT                  = (Client ID)

        ID                      = (Text ID)

        LANGUAGE                = (Language)

        NAME                    = (PO Number)

        OBJECT                  = 'EKKO' for Header & EKPO for Item

      TABLES

        LINES                   = (Internal Table of type tlines)

      EXCEPTIONS

        ID                      = 1

        LANGUAGE                = 2

        NAME                    = 3

        NOT_FOUND               = 4

        OBJECT                  = 5

        REFERENCE_CHECK         = 6

        WRONG_ACCESS_TO_ARCHIVE = 7

        OTHERS                  = 8.

출처: http://scn.sap.com/thread/1537830