Hi,
You can use design layer for this but this will be generic.
But you need to identify if the BP is required for masking or not. This can be achieved via coding only. For this you can do a generic coding after executing GET_METHOD thru enhancement and change the value.
Reason: for using the above mentioned way is BP can appear in many places like : IC, search result, Parties involved in a Transaction data etc.
Regards,
Naveen Kumar.