You can't post in the past. with Moving average everything is settled immediately there is no month end process to readjust transactions. Moving average is a pure, perpetual, weighted average,
When you use items that are associated with the moving average model, for the assignment of costs:
Issues are always assigned a moving average cost.
You cannot associate costs, with specific receipt transactions.
The concept of marking does not apply.
Adjustments occur in real time. IC does not adjust the transactions nor can you do any standard adjustment in the Inventory closing form for items that are Moving average. The inventory close process only closes the accounting period,
A revaluation can be posted at any time as a manual process.
To quote from Docs:
If you need to adjust the moving average cost of a product, inventory adjustments are allowed as of today’s date. You cannot backdate an inventory adjustment to correct the moving average cost of a product. You cannot have the cost flow through subsequent transactions.
1.Select the product for which to adjust the moving average cost .
The Revaluation for moving average form examines the inventory available for a product.
The product selected has a posted quantity of 1, a posted a value of 12.00, a posted unit cost of 12.00, and a unit cost of 12.00.
2.Now update the unit cost field to 16.00. The system calculates the remaining fields.
In the Settlements for voucher form, you will see an adjustment of 4.00 posted to the Cost revaluation for moving average account.
3.The adjustment is posted.
Note. You can only adjust the moving average cost as of today’s date.