/SCWM/PACK - Screen BADI Implementation

Hello,

i'm implementing a BADI for the standard /scwm/pack transaction. Well i created a new Function Group with the Screen 299 and the PBO. My Screen are displayed in correct Scanner. But i'm still not sure if this the correct way to do this.

So, do i have to create a new Z function Group for my coding

or

is there a way to enhance the standard package provided by SAP /SCWM/UI_PACKING.

Thanks for you help

Tobi