UPDATE:  The PPV account has been re-implemented at Odoo 16.

Read about the change at https://github.com/odoo/odoo/commit/96639e7e0d7d71b81f0cac923290093f3feee42f

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There is no longer a Price Difference Account on the Product Category

Here is what happens with Odoo 16:

With Average Cost (AVCO) and First In First Out Cost (FIFO) databases

• we automatically re-value product inventory costs based on the Vendor Bill price, even if the Purchase Order price is different
• recommended for most users

With Standard Cost (STANDARD) databases

• you have the same PPV capabilities, streamlined to use the Stock Interim (Received) account
• this gives you options to reclass / land / expense / capitalize any PPV value
• standard cost is used to value products coming into inventory 
• price differences (or rebates) are stored in the residual field on the journal item that over (or under) clears the interim account [this is where PPV is stored now]
• this amount is the amount that the interim account will be over or under for this product inbound receipt from the related purchase order
• filter the interim account by Journal to see the journal items in the AP/Vendor Bill journal (the ones partially clearing the account), they also show the PO, Vendor and Product
• we automatically partially reconcile these journal items with the journal items from the inbound Receipt Transfers (the inventory credits)
• robust warehouse processes needed
• regular reconciliation of the stock journal is required (needs to be completed before you run a balance sheet or profit and loss report)
• recommended if you need to monitor and manage product cost price variances

To recap what was happening at Odoo 15 (with a PPV account configured):

• Green: You receive products from a Purchase Order where the cost is $1,000, current asset increase
  
• Blue: Your $1,100 Bill didn't match so we book PPV and pre-balance the inventory clearing account
  
• Red: The adjusted value of goods is posted to AP and inventory clearing is emptied
  
• Black: Your Inventory is still valued at $1,000 until you land the $100 left in the Price Difference account
  

What we do at Odoo 16 (non standard costing approaches):

• Green: You receive products from a Purchase Order where the cost is $1,000
• Blue: Your $1,100 Bill didn't match so we adjust inventory and pre-balance the inventory clearing account
  
• Red: The adjusted value of goods is posted to AP and inventory clearing is emptied
  
• Black: Your Inventory is valued at $1,100
  

The Stock Report (new) provides two options for non-Accounting users to review this information:

1. Valuation Report - shows the original price and any adjustments to the total value
2. History - click to see the Receipt line, then click to see the Receipt, then click to see the Purchase Order and the original price