Wrong sales order roll back after a credit note

[giusba71]

Hi all,
I had to credit a delivery made, but in the related Sales Order every row of the item credited have been decremented of the quantity credited.

In details, I've generated a credit note for 3 pcs of an item against a Sales Order.The SO has the same item due in different dates and different qty, some delivered, some partially delivered and some to be delivered.
After the credit note, every row with that item (completed or not) have been decremented by 3 pcs.
A completed row of 34 pcs becomes 31, a completed row of 20 pcs becomes 17, a partially delivered row of 9 of 15 becomes 6 of 15 and an full outstanding row of 3 pcs becomes -3 (see image below).

Giusba