[FIX][9.0][backport]A user can only select the operating units that h…

…e is allowed (#60)

* [UPT]A user can only select the operating units that he is allowed

* [FIX] Purchase OU. The check is done in the PO line

operating_unit/security/operating_unit_security.xml

@@ -14,5 +14,17 @@
         <field name="domain_force">['|',('company_id','=',False),('company_id','child_of',[user.company_id.id])]</field>
     </record>
 
+    <record id="ir_rule_operating_unit_allowed_operating_units"
+            model="ir.rule">
+        <field name="model_id" ref="model_operating_unit"/>
+        <field name="domain_force">[('id','in',[g.id for g in user.operating_unit_ids])]</field>
+        <field name="name">Allowed operating units</field>
+        <field name="global" eval="True"/>
+        <field eval="0" name="perm_unlink"/>
+        <field eval="0" name="perm_write"/>
+        <field eval="1" name="perm_read"/>
+        <field eval="0" name="perm_create"/>
+    </record>
+
 </data>
 </openerp>

purchase_operating_unit/models/purchase.py

@@ -97,16 +97,6 @@ def _prepare_picking(self):
         picking_vals['operating_unit_id'] = self.operating_unit_id.id
         return picking_vals
 
-    @api.constrains('invoice_ids', 'operating_unit_id')
-    def _check_invoice_ou(self):
-        for po in self:
-            for invoice in po.invoice_ids:
-                if invoice.operating_unit_id != po.operating_unit_id:
-                    raise ValidationError(
-                        _('The operating unit of the purchase order must '
-                          'be the same as in the associated invoices.')
-                    )
-
 
 class PurchaseOrderLine(models.Model):
     _inherit = 'purchase.order.line'