F4812 update statement.

Hi Team,

I working on R1732(Base table is F1721) ,I got a requirement , where i need to update F4812 table based on some conditions. But the challenge here im facing is, i do not have all the matching Key combination values in my Base table for updating F4812(F4812.Update Statement). Is it possible to update to update F4812, with a single key(eventhough for a particular key combination in F4812 Update statement where we have 5 keys and if we pass only a Single key value from my base table F1721). Is it mandatory that we have to pass all the key values