It would be helpful to state exactly what you want.
@Sweey I have difficulty understanding the issue myself. Are you able to post some screenshot that would show what you see vs what you expect to see instead?
@lubos Inventory calculation is not stable. When entering sales transactions, sometimes the cost of sales is calculated correctly and sometimes it is not calculated correctly.
When recalculating, the average cost is adjusted, but sometimes by the periodic inventory system and sometimes by the perpetual inventory system.
You are thinking like this because Manager uses the previously calculated Unit cost for Items (You can find this under Settings>Inventory Unit Costs). So when avg cost doesn’t change between Sales transactions you get the correct costs.
But when unit cost changes between Sales transactions the system still uses the previously available Unit cost until you run the Cost correction worksheet and when you do so Manager will update the unit cost, and your figures will get corrected.
This is making you think