[IMP] purchase: double validation minimum amount

addons/purchase/company.py

@@ -17,3 +17,5 @@ class company(models.Model):
         ('two_step', 'Get 2 levels of approvals to confirm a purchase order')
         ], string="Levels of Approvals", default='one_step',\
         help="Provide a double validation mechanism for purchases")
+    po_double_validation_amount = fields.Monetary(string='Double validation amount', default=5000,\
+        help="Minimum amount for which a double validation is required")

addons/purchase/company_view.xml

@@ -11,6 +11,7 @@
                 <xpath expr="//group[@name='logistics_grp']" position="inside">
                         <field name="po_lead"/>
                         <field name="po_double_validation" widget="radio"/>
+                        <field name="po_double_validation_amount" attrs="{'invisible': [('po_double_validation', '=', 'one_step')]}"/>
                 </xpath>
             </field>
         </record>

addons/purchase/purchase.py

@@ -280,12 +280,14 @@ class PurchaseOrder(models.Model):
                 line.product_id.write(vals)
 
         # Deal with double validation process
-        if self.user_has_groups('purchase.group_purchase_manager'):
+        if self.po_double_validation == 'one_step'\
+                or (self.po_double_validation == 'two_step'\
+                    and self.amount_total < self.env.user.company_id.currency_id.compute(self.company_id.po_double_validation_amount, self.currency_id))\
+                or self.user_has_groups('purchase.group_purchase_manager'):
             return self.button_approve()
-        elif self.po_double_validation == 'two_step':
-            self.write({'state': 'to approve'})
         else:
-            return self.button_approve()
+            self.write({'state': 'to approve'})
+            return {}
 
     @api.multi
     def button_cancel(self):

addons/purchase/purchase_view.xml

@@ -151,10 +151,7 @@
                     <button name="button_cancel" states="draft,to approve,sent,purchase" string="Cancel" type="object" />
                     <button name="button_done" type="object" string="Set to Done" states="purchase"
                         help="If a purchase order is done, you can not modify it manually anymore. But you will still be able to bill or receive."/>
-                    <field name="state" widget="statusbar" statusbar_visible="draft,sent,purchase,done" readonly="1"
-                        attrs="{'invisible': [('po_double_validation', '=', 'two_step')]}"/>
-                    <field name="state" widget="statusbar" statusbar_visible="draft,sent,to approve,purchase,done" readonly="1"
-                        attrs="{'invisible': [('po_double_validation', '=', 'one_step')]}"/>
+                    <field name="state" widget="statusbar" statusbar_visible="draft,sent,purchase,done" readonly="1" />
                 </header>
                 <sheet>
                     <div class="oe_button_box" name="button_box">