How to derive second segment from AR Refund AP invoices

Summary:

The AR Refund transactions are flown to AP as payment requests where the second segment is default from receivables activity. we need to derive second segment same as the refund transaction.

Content (please ensure you mask any confidential information):

Hi

We have a issue in oracle fusion.

There are receivable refunds that are imported to payables as payment requests. In those AP invoices, the second segment "unit" is coming as default from receivables activity defined in receivables. Client is using sandbox level access to users based on Second segment. No user has access to default segment.

We have multiple locations assigned to a BU.