Issue with Cost of item

Hi all, please suggest on the below.

We have a sale order created and processed for 100$ and the related credit order was also created for 100$. But before the credit order was ship confirmed there was a OV that came in for the same item/BP which changed the item cost. So, when the credit order was ship confirmed the unit cost was changed to 170$. The item ledger was hit for 170$ for the C1. But the GL for the C1 has hit for 100$. Still the extended cost field in F4211/F42199 is showing 100$ only. Only the transfer cost field is updated as 170$.