In V8.82 it is now possible to create an item type AR/AP Credit Note without affecting the stock quantity e.g. helpful if processing a price change for a posted invoice or if if the delivered goods were damaged or destroyed during shipment and are therefore not returned.
To use this feature, go to AR/AP Credit Note and choose 'Form Settings'. In the tab 'Table Format' tick the box next to 'Without Qty Posting' to make this column visible.
NB. you can also move this column so that it is visible on the AR Credit screen: when in 'Form Settings/Table Format' highlight 'Without Qty Posting' by clicking and holding until a black outline appears around the cell. Once the black outline is visible you can drag the field up or down the list as desired.
Once the column 'Without Qty Posting' is visible in the AR Credit Note screen, you can choose not to post the items back in to stock by ticking the box.