Odoo programatically add taxes to purchase order in python

Question

I am creating purchase orders from an external source (online xml request). While I loop over every order I create a purchase order, then I loop over the products and create an orderline for each product.

All of this is working except for adding taxes. I am puzzled on how to add the taxes. Should I add the values immediately to the purchase order like this ->

# Create orderline foreach product (this happens in the loop foreach product)
orderlineList =  {
                'name': itemText,
                'product_id': itemId,
                'product_qty': itemOrdered,
                'product_uom': 1,
                'price_unit': itemPrice,
                'date_planned': orderDatePlanned,
            }

            struct = orderlinetuple + (orderlineList,)
            po_vals.append(struct)

 #This adds all the orderlines into 'order_line'
  orderDict = { 
         'amount_untaxed' : totalNet,
         'amount_tax': totalTax,
         'partner_id': api_partner,
         'amount_total' : totalBrut,
         'order_line': po_vals,
     }
# Then we create the purchase order with the added orderlines in one go
  self.PurchaseOrder = self.env['purchase.order']   
  po_id = self.PurchaseOrder.create(orderDict)

If i create my purchase orders like this the amount_tax and amount_total are ignored I just get the totals from the orderlines without taxes.

Is this the wrong way? I have read about calling onchange on the purchase order but I am unsure how this works since I don't see how that will add taxes

this picture show orderlines has no taxes

This picture show the order has no taxes

In short, how to add taxes (f.e. 21%) to a purchase order when created from the backend in python.

Kudos to the person who can point me in the right direction, been trying to find this for the last 3 days...

Answer 1

You need to call default on-change method of odoo.

When you call on-change method then system will automatic set tax based on product default tax and purchase order fiscal position.

Step 1: You need to create purchase order without adding any order lines

self.env['purchase.order'].create({'partner_id':'',...})

Step 2: Create all purchase order line using following method.

    new_record=self.env['purchase.order.line'].new({'order_id':purchase_order.id,
              'product_id':product_id,
              'product_uom':uom+id,
              'name':product_name
              })

    new_record.onchange_product_id()
    order_vals=new_record._convert_to_write({name: new_record[name] for name in new_record._cache}) 
    order_vals.update({'product_qty':product_qty,'price_unit':price_unit})
    self.env['purchase.order.line'].create(order_vals)

In step-2 we have create purchase order line and call onchange_product_id method. It will automatically calculate tax based on purchase order fiscal position and product default tax.

This may help you.