How to change a BaDi in SRM for classic Extended

Hello Everyone,

I'm new to SRM and need to change the cost distribution button so that it is disabled when the PO is a Limited Order. I have see several note about using Badi bbp_ui_control_badi to make the change.

Can some tell me HOW and WHERE I can make this change in SRM. I need to the cost distribution button to be disabled only for Limited Orders.

I have never made a BaDi change in SRM so what ever tips or link you can provide would be very helpful.

Thanks,

Sam