of course it's taking only one record... you've got one line per mat/plant...
to load all records:
or you insert one field per value
MATNR PLANT PALPAT1 PALPAT2 PALPAT3 PALPAT4 MEINS PALUM LAYUM
1007501 TGDL MXBLANCA MXBOTELLA MXCAJA MXCHEP CS PAL LAY
or you create a new master data with palpat as compound.
choice depends on your reporting requirements.
M.