We received an Invoice with 5 items.
Later on, we received a credit note for 1 item where vendor proposed rate change- reducing original value to a reduced value - say original value was 10$ per unit, and new value is 8$ per unit - reduction of 2$ per unit.
We posted a Credit note via Charge Item feature where we wanted to post reduction in Invoice value by 2$ per unit and payable to vendor as well.
The vendor ledger entry effect and respective purchase GL effect went well impacting 2$ everywhere, but the cost at Purchase Receipt level of the said item changed from $10 to $ 2 instead of $8!! Thus impacting the "Last Direct Unit Cost" at Item card level and its average cost.
Please advise why this happened and how should I get the right value of item back?