Where Can I settle an enhancement to delete a sales order item according to the data in BDOC from CRM?

Hi expert,

I have an urgent requirement from the client.

Delete the sales order item totally in ECC.

I planned to implement this enhancement in ECC. Check the data in BDOC from CRM middleware, according to the user status in the order item,decide whether the item can be deleted.

My question is,where can I settle this enhancement? The BADI name,user exit?

Thanks in advance.

Jerry.