Is there a way to update the receipt qty when the receipt status is already "Moved"?

We have an issue where the user is changing the conversion rate before the PO has been received.

For example:

An Item was set up as 1 CA = 80 EA. A PO was created for 6 CA (480 EA). Later, the conversion rate was changed in the item master to 1 CA = 30 EA. When the receipt for 6 CA was entered, the system calculated it as 180 EA and now shows only 180 EA received (2.25 CA), leaving 300 EA “remaining”, even though the PO was fully received.

We are trying to find a way to update the receipt qty online to match the PO, but the receipt is already disabled due to "Moved" status.