What does this code do

hi friends, i came across this code, and i am struck at understanding this code,
usually loop keyword will be followed by itab, but here there is nothing, same with sort.
    SORT.
LOOP.
    AT NEW MSEG-WERKS.
some code
    ENDAT.
    AT NEW MSEG-MATNR.
some code
      NEW-PAGE.
    ENDAT.
    AT DETAIL.
      WRITE:
      / MSEG-LGORT,
        MSEG-BWART,
        MSEG-MBLNR,
        MSEG-ZEILE.
    ENDAT.
    AT END OF MSEG-MATNR.
      SKIP 1.
      WRITE: 'x y z..'
    ENDAT.
    AT END OF MSEG-WERKS.
      SKIP 1.
     WRITE: 'x y z..'
    ENDAT.
ENDLOOP.
an some one please explain me this code, little briefly.
thank you.

sorry friends, i forgot to tell that the following piece of code was above this code:
INSERT
MSEG-WERKS                             "Plant
MSEG-MATNR                             "Material
MSEG-MBLNR                             "Material document
MSEG-ZEILE                             "Material item
INTO HEADER.
INSERT
LIPS-VBELN                             "Delivery
LIPS-POSNR                             "Delivery item
MSEG-LGORT                             "Storage location
MSEG-BWART                             "Movement type
MSEG-MENGE                             "Quantity
MSEG-SHKZG                             "Debit/credit
MSEG-MEINS                                                  "UoM
INTO DETAIL.

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Message was edited by:
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