Two records with same key (Infocube)

Hi,

I was trying to do, in a update rule, an "IF" condition with two key figures.

IF Kf1 > Kf2. result = Kf1 else result = Kf2.

But the data in the source (datamart Infocube to infocube) have tow records with the same characteristics combination (the same keys)and different amount in the keyfigures, then the result of my "if" condition is not the expected because I understood in the infocube only exists one characteristics combination. :S

I was seeing those records in the manage transaction of the infocube.

Some reason for this?

Thanks and regards

Victoria Leó