Steps.

1. Login as admin.
2. Create postpaid customer for daily basis invoice generate with credit limit.
3. create a product as recurring/one time.
4. now purchase above product.
5. make some Outbound and free calls for generate call charges.
6. now wait for next day or some days.
7. when invoice generated successfully, then make partial payment of invoice through paypal method or account balance.
8. when invoice partail payment done, then download new generated invoice and observe.

Actual result :- When Invoice payment through paypal/account balance successfully, then after download the invoice of paid amount invoice, then Payment received amount displayed as zero in downloaded invoice.

Expected result :- Amount should be display fine in downloaded invoice which are made actual payment of amount.

See latest attached screenshot :-