...
- Control Balances When Posting and Undo Posting of Documents option allows checking if item in stock
- Additionally Check Stock Balances on Document Date and Time option checks if item in stock according to posted documents (stronger condition)
3) Credit Note (Goods Return) / Credit Note (Invoice Correction) may be posted with or without ACP.
To use option to revert ACP as items are returned from customer, enable an option in Administration > Settings > Sales > Calculate Cost of Goods Sold in Credit Note:
...