Activation of Latest Business Function without Activating Older

Hi,

We have recently upgraded our system to Enhancement Package 5.

We need a functionality that is avaialble through Business Function (PSM_FM_CI_3). However, there are two similar business functions PSM_FM_CI_1 and PSM_FM_CI_2, which were released as part of EHP4 but we never activated those.

My question, is can we activate the latest Business Function only or we will have to activate all the three?

Regards,

Hanif