I have posted and paid a posted purchase invoice for EUR 200
Now the item had been returned and I have received EUR back on my bankaccount
So I need to post a negative amount. I can not cancel the previous posted invoice. So I tried to create a new purchase invoice with a negative amount. But then I get the message:
Amount must be negative in Gen. Journal Line Journal Template Name=’Journal Batch Name=’line’=Line No.=’0′.
Can anyone help me how can I post this payment, and correct the first invoice?