I want create a scenario ,when stock will become below a minimum level an automatic purchase order need to be placed.For that I have Created a minimum stock rule(reordering rule).So when product qty become less than minimum quantity a purchase order will be placed using the option 'warehouse->scheduler->run scheduler' It is working fine. But I need to place the purchase order automatically in monthly or weekly base, without using the option 'warehouse->scheduler->run scheduler'.So for that I have tried to use the scheduling option I have write the code like this.

 <record forcecreate="True" id="ir_cron_purchase_fine_action" model="ir.cron">
      <field name="name">Run Purchase Fine Scheduler</field>
      <field eval="True" name="active" />
      <field name="user_id" ref="base.user_root" />
      <field name="interval_number">1</field>
      <field name="interval_type">days</field>
      <field name="numbercall">1</field>
      <field eval="'purchase.order'" name="model" />
      <field eval="'run_scheduler'" name="function" />
      <field eval="'(False,)'" name="args" />
    </record>

But scheduling is not working , I have also tried to create schedule from the option 'administartion->schedule->scheduled action' . But Still the scheduling is not working and no purchase order is placed in it. I am doing this on my local machine,not on server is that the issue.?