Returns

We are selling beer to supermarkets and restaurants. For the supermarkets we take back stock if more than 2 months before expiry date. Now we might have 50 different sales invoices with different products. And then cthe client returns 4 differet products that are split across different sales invoices. There is no way to find which bottle belongs to which sales invoice.

I have to be able to issue a credit note and enter lines with the relevant products (and batches - expiry dates). Stock should be returned and Sales/COGS adjusted. 

At the moment I have no other way than to create a credit note with a service item "refund" and then do a manual stock adjustment. Not really convinient and exact and can be a source of errors.