Update rule mapping

Hello Gurus -

I have 2 different infopacks running from an Infosource to Data target (Infocube). Both infopacks had the below update rule mapping for key figures for different time frames:

KF1--->KF1 (0 to 6 months)

KF1--->KF1 (7 to 12 months)

I need to change one of them to KF2---> KF1, but the problem is when I change one, even the other one changes. Can you please let me know how to avoid this. Appreciate your help!

Thanks

Varun