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I am working, with Inventory transfer, but I face Access Error when I press validate That 

==================================================
Due to security restrictions, you are not allowed to access 'Picking Type' (stock.picking.type) records.


Contact your administrator to request access if necessary.
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I try To inherit the validation button event and this code 

class StockPicking(models.Model):
_inherit = 'stock.picking'

def button_validate(self):
# Clean-up the context key at validation to avoid forcing the creation of immediate
# transfers.
ctx = dict(self.env.context)
ctx.pop('default_immediate_transfer', None)
self = self.with_context(ctx)

# Sanity checks.
if not self.env.context.get('skip_sanity_check', False):
self._sanity_check()

self.message_subscribe([self.env.user.partner_id.id])

# Run the pre-validation wizards. Processing a pre-validation wizard should work on the
# moves and/or the context and never call `_action_done`.
if not self.env.context.get('button_validate_picking_ids'):
self = self.with_context(button_validate_picking_ids=self.ids)
res = self._pre_action_done_hook()
if res is not True:
return res

# Call `_action_done`.
pickings_not_to_backorder = self.filtered(lambda p: p.picking_type_id.create_backorder == 'never')
if self.env.context.get('picking_ids_not_to_backorder'):
pickings_not_to_backorder |= self.browse(self.env.context['picking_ids_not_to_backorder']).filtered(
lambda p: p.picking_type_id.create_backorder != 'always'
)
pickings_to_backorder = self - pickings_not_to_backorder
pickings_not_to_backorder.with_context(cancel_backorder=True)._action_done()
pickings_to_backorder.with_context(cancel_backorder=False)._action_done()

if self.user_has_groups('stock.group_reception_report'):
pickings_show_report = self.filtered(lambda p: p.picking_type_id.auto_show_reception_report)
lines = pickings_show_report.move_ids.filtered(lambda m: m.product_id.type == 'product' and m.state != 'cancel' and m.quantity_done and not m.move_dest_ids)
if lines:
# don't show reception report if all already assigned/nothing to assign
wh_location_ids = self.env['stock.location']._search([('id', 'child_of', pickings_show_report.picking_type_id.warehouse_id.view_location_id.ids), ('usage', '!=', 'supplier')])
if self.env['stock.move'].search([
('state', 'in', ['confirmed', 'partially_available', 'waiting', 'assigned']),
('product_qty', '>', 0),
('location_id', 'in', wh_location_ids),
('move_orig_ids', '=', False),
('picking_id', 'not in', pickings_show_report.ids),
('product_id', 'in', lines.product_id.ids)], limit=1):
action = pickings_show_report.action_view_reception_report()
action['context'] = {'default_picking_ids': pickings_show_report.ids}
return action
return True


How can I find the code section that used for this validation 
I need to stop this message programmatically 

please can any one help me 

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