Documents with the Customer Debt Assignment transaction type are created when your entity needs to transfer the customer debt to a company that is affiliated with this customer. The transaction should result in positive balance in any of the documents.
For example, you can use a document with this transaction type when your entity needs to offset the customer debt with a payment made by a third-party company that is actually affiliated with this customer as the headquarters and its subsidiary. The headquarters company issued a consolidated payment for purchases separately made by its subsidiaries, and you need to apply invoices of different customers (subsidiaries) one by one to this payment.