Hi NSPhoenix,
in your case the problem is that there is no real movement of items, therefore you cannot do just a positive invoice to offset the return order because it will move the inventory.
Below a detailed explanation of what I would do:
1) Look at the voucher posted by the Credit Note with credit only, it should look something like below, with all the accounts going to zero apart from the Customer balance, Sales order revenue and tax that remain open:
You have to offset the revenue and the tax and to have a balance to offset the outstanding one on the customer.
You have two ways of doing that: Through a Sales Order
1) Go to All sales orders and either a new Sales Order for the Customer you have to reverse the credit nore by clicking ohe "New" button;
3) Now important thing is that you cannot use an product of the type item on the lines because you would be moving the inventory. Instead you have to add a line using a service type item and the quantity shold be the same as the credit note but with a positive sign and the same line amount. You can use the "Main account" field to "forse the revenue account to offset:
2) Be sure that the totals and the taxes are the same as the one posted before by checking on the Sales order tab--> Totals This should correspond to the total of the credit note, ust reversed):
Be sure that also the amount of the sales tax is the same but reversed by clicking on "Sales tax" in tab "Sell":
If al three (revenues, sales tax and totals) match, you can invoice
3) The voucher should look like this:
4) as a last touch, go to the customer master and settle the new invoice and the credit note together so that no transactions are open:
Please first test and check the result in a demo environment with the accountants of the company to see if this solution matches all their requirements.
Hope it helps