Custom button +CUS1 in IH01 transaction don't appear.

Hello gurus.

I have a requirement to add a custom button in transaction IH01.

I've modified MAIN status in report RIIFLO01 and add +CUS1 button adding an icon and a description. .

I've implemented BADI_EAM_RIIFLO20_FCODE_CUS1 and BADI_EAM_STRUCTLIST_FCODE_CUS1.

The problem is that the button +CUS1 don't appear in the screen.

Thanks in advance.