How Create "ME_GUI_PO_CUST" Implementation

Hi Abapers, I need create a new Implementation for BADI "ME_GUI_PO_CUST" (For Extending Tx ME22N), but i see this BADI already has standard implementation activated ,  and i think can't use other.

how can create another implementation without erasing the previous BADI implementation

i hope can help me ty.