Discrepancies between the Cardex & GL for standard cost

Please help me with the bellow case :

We use standard cost.

The qty is updated on Shipment Confirmation.

When a transaction passed from the Shipment Confirmation stage, a line with the relevant qty and cost is created in Item Ledger.

If we change the standard cost of this item before Sales update and after we run it, then the Item ledger’s cost don’t change but the GL entry take in consideration the new cost.

This fact creates discrepancies between Item Ledger and GL.

There is any way to avoid this ?

Thanks,

Demos