1. First I created products in standard costing method. 2

2. But did not updated cost price of that products.3

3. Created several purchase order and add product's price in that particular PO.

4. Still the product cost price = 0

5. I need to Convert all products costing method from standard to average costing method to implement landed cost.         

             1. Changed cost price =0 to cost price = 100(just a numeric value)

             2. Costing method from standard to average.

             3. Inventory valuation from periodical(manual) to real time(automated) 

            4. Updated all accounts - Input , Output , Inventory valuation, stock journal, income and                            expense accounts.

Process starts from here,

Explain through an example:

Sample product.  Cost price = 0, Quantity = 5.

Converted product costing method from standard to average(Updated above mentioned all things).

Updated the Cost price = 250.

Created Purchase order: Cost price 270 and Quantity = 10.

After validating incoming shipment products cost price should be:

250*5(previous stock) + 270*10(current stock) > (250*5+270*10)/15 = 263.33.(value from calculator)

(0*5+270*10)/15 = 180 (value from odoo).

Why this calculation variation? Product's cost price not changing from CP = 0 to CP = 250.

Then i created landed cost for the picking, same calculation variation occurred in product's cost price. 

How can i solve this? Any suggestions? Please help me to solve this issue.