RANK - forum topic by SabelSweden

Hi,
I have a table like this:
ALTKN     DOCNUM                    KUNNR
000015  0000000058789756 198520
000015  0000000058843478 198520
000015  0000000058891716 198520
I will only get the row with the highest DOCNUM. SQL syntax to read only this rows?
000015  0000000058891716 198520
Regards
Mikael