I need to devlope a custome moudle that subtract and add product(material) quantity on hand based on users form. My Question is how to retrive a single value from Qunatity on Hand cell and update the value to the cell. Just for python method or function.
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If you are talking about Product's quantity on hand, it can be retrieved from qty_available (Quantity On Hand) field of the Product. It is a calculated field. To update, you cannot directly update the qty_available field, because it is a calculated field. You need to actually create a stock.move to account for the quantity difference. One mechansim that Odoo has provided for your is through Physical Inventory. Another way it from the Update button next to the qty_available field which in turn will call the stock.change.product.qty wizard (odoo/addons/stock/wizard/stock_change_product_qty.py) that will create the new stock.move.
