Payment Issue of AR Refund Service Level

Hi,

Env: R12.1.3

I do see, we do not have Service Level code field on AP Invoice (Standard/Payment Request). In our scenario, we are doing seeded AR refund functionality, however we wish to maintain service level code for each AR refund we do.

We wish to avoid maintaining DFF at AP Invoice level or Refund level.  I also see that, payment details at Customer site level has service level code field however, if I'm not incorrect, it is meant for Fund Capture and not for disbursement. Our case is disbursement to customer via PPR. Request your insight here. Thanks in advance!