Derive Actual Cost for Lot-Grade Change

Summary:

We have Actual Cost for the Primary Cost Book and the Cost valuation unit is defined for COSTORG_INVORG_LOT_GRADE. When the item is produced, it has Grade as 0 with a specific Actual cost. Later when we update the Grade, there isn't a way to update a new cost. We would like to default the cost from the previous layer (with Grade 0) when a new grade is updated for that lot. Is there a way to achieve this? We are facing an issue now with all the Lot Grade change transactions stuck with Cost Processor and it's more cumbersome for the layer to be created with an Account Alias Receipt and Issue