How to adjust supplier outstanding amount using new invoice?

[lubos]

There is no easier way than this right now. In future, it will be possible to do this transactions in more automated way, see another feature request which is a bit related:

Automatically allocate money over outstanding invoices

There should be an Payment voucher / Receipt option so that If I received 4000 from a customer and I issued him a receipt after that now I want to enter it into Manager and this payment should be entered into that customer account and that amount should be deducted periodically from his previous invoices like invoices are of 1400, 800, 1500, 500, 250 so there should be outstanding 200 in the invoice of 500. That will be very helpful.