[IMP] point_of_sale: Stat button to invoice on pos_order view

Purpose:
In POS order form view the 'Re-Print' button is placed improperly.
There should be a way where invoice can be linked to POS without this button..

Removed the reprint button from the form view of POS order.
And add the invoice state button so invoice can be linked to POS.

addons/point_of_sale/models/pos_order.py

@@ -411,6 +411,18 @@ class PosOrder(models.Model):
     def action_invoice_state(self):
         self.write({'state': 'invoiced'})
 
+    @api.multi
+    def action_view_invoice(self):
+        return {
+            'name': _('Customer Invoice'),
+            'view_mode': 'form',
+            'view_id': self.env.ref('account.invoice_form').id,
+            'res_model': 'account.invoice',
+            'context': "{'type':'out_invoice'}",
+            'type': 'ir.actions.act_window',
+            'res_id': self.invoice_id.id,
+        }
+
     @api.multi
     def action_invoice(self):
         Invoice = self.env['account.invoice']

addons/point_of_sale/views/pos_order_view.xml

@@ -13,6 +13,15 @@
                     <field name="state" widget="statusbar" statusbar_visible="draft,paid,done" statusbar_colors='{"cancel":"red"}'/>
                 </header>
                 <sheet>
+                <div class="oe_button_box" name="button_box">
+                    <button name="action_view_invoice"
+                        string="Invoice"
+                        type="object"
+                        class="oe_stat_button"
+                        icon="fa-pencil-square-o"
+                        attrs="{'invisible':[('state','!=','invoiced')]}">
+                    </button>
+                </div>
                 <group col="4" colspan="4" name="order_fields">
                     <field name="name"/>
                     <field name="date_order"/>
@@ -78,15 +87,9 @@
                         <group string="Accounting Information">
                             <group>
                                 <field name="sale_journal" domain="[('type','=','sale')]"/>
-                                <field name="invoice_id" readonly="1"
-                                    attrs="{'invisible':[('state','&lt;&gt;','invoiced')]}"/>
                                 <field name="account_move" readonly="1"
                                         attrs="{'invisible':[('state','&lt;&gt;','done')]}"/>
                             </group>
-                            <group>
-                                <button name="%(pos_invoice_report)d" string="Re-Print"
-                                    icon="gtk-print" type="action" attrs="{'invisible':[('state','&lt;&gt;','invoiced')]}"/>
-                            </group>
                         </group>
                     </page>
                     <page string="Notes" >
@@ -125,7 +128,6 @@
                 <field name="partner_id"/>
                 <field name="date_order"/>
                 <field name="user_id"/>
-                <field name="invoice_id"/>
                 <field name="amount_total" sum="Amount total" widget="monetary"/>
                 <field name="company_id" groups="base.group_multi_company"/>
                 <field name="state"/>