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Solution: The Debit Note With Invoice Correction type should be created for this case, please follow the steps below:
1) Suppose that you have entered Invoice received for 4,000 AED for 2 items with different quantity and want to reduce the amount by 500 AED having total payable amount 3,500 AED (invoice received is not paid yet) :
2) Create Debit Note using generate option, select Invoice correction Type:
3)