how to capture purpose of payment for AP Payments

we have a requirement to capture the purpose of payment codes for payments in oracle payables. banks will be providing us the list of payment purpose country specific codes to us. we need to make it availble to the users so that payment users ensure the select the respective country specific code while making the payment. so based on this payment purpose also, banks will be able to identify the payment details.

please let us know how to capture this in oracle. i hope this requirement might have come across many clients. did Oracle provide us any feature to capture these details or do we have to go ahead with the DFF only.