Hi Hadeel Khattab

There are some customisation needed as below.

Code for purchase order line:

po = fields.Boolean(string='Po')

@api.model
def create(self,vals):
if vals.get('order_id'):
order_id = self.env['purchase.order'].browse(vals['order_id'])
if order_id.state == 'draft':
vals.update({
'po':True
})
return super(purchaseOrderLine, self).create(vals)

From xml side :

{'readonly': [('po','=',True)]}

Thanks & Regards,

Email: odoo@aktivsoftware.com

Skype: kalpeshmaheshwari

Hi,

Try this in your xml view by inheriting  "purchase_order_form" from purchase ,

< record id="view_po_form_inherit" model="ir.ui.view" >
    < field name="name">purchase.order.form < /field >
    < field name="model">purchase.order< /field >
    < field name="inherit_id" ref="purchase.purchase_order_form" / >
    < field name="arch" type="xml" >
         < xpath expr="/form/sheet/notebook/page[1]/field[@name='order_line']/tree/field[@name='product_qty']"        position="replace" >
             < field name="product_qty" attrs="{'readonly': [('parent.state', '!=', 'draft')]}" />
        < /xpath >
    < /field >
< /record >

Thanks