SUM, per material?

Hi,

I have an internal table:

material price

111111 10,00

111111 15,00

222111 12,00

222111 18,00

How to use SUM to get total price PER material? Which statement tu use?

ON CHANGE of material doesnt work..I get total price of all materials..

111111 25,00

222111 30,00

thanks..