Currently the account determination for ALL items is set by Item group / Item.
There is a requirement for less than 1% of all item Sales Orders / AR Invoices to be processed with a different COGS account to the automatic determination. (this circumstance is not necessary related to specific items, it could occur with any items).
The process will be to enter a SO, Delivery / AR invoice (all transactions could be entered by different people).
Any suggestions on how to process the requirements seemlessly, for the operator and affect the correct COGS account/s?