<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>

    <report
      string="Comparative Bid Analysis"
      id="action_report_purchase_requisitions"
      model="purchase.requisition"
      report_type="qweb-pdf"
      name="purchase_requisition_bid_selection.report_purchaserequisitions"
      file="purchase_requisition_bid_selection.report_purchaserequisitions"
      />
  </data>
  <data noupdate="1">
    <record id="paperformat_bid_selection" model="report.paperformat">
      <field name="name">Bid selection</field>
      <field name="orientation">Landscape</field>
      <field name="margin_top">5</field>
      <field name="margin_bottom">15</field>
      <field name="header_spacing">0</field>
    </record>

    <record id="action_report_purchase_requisitions" model="ir.actions.report.xml">
      <field name="paperformat_id" ref="paperformat_bid_selection"/>
    </record>

  </data>
</openerp>

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>

    <report
      string="Comparative Bid Analysis"
      id="action_report_purchase_requisitions"
      model="purchase.requisition"
      report_type="qweb-pdf"
      name="purchase_requisition_bid_selection.report_purchaserequisitions"
      file="purchase_requisition_bid_selection.report_purchaserequisitions"
      />
  </data>
  <data noupdate="1">
    <record id="paperformat_bid_selection" model="report.paperformat">
      <field name="name">Bid selection</field>
      <field name="orientation">Landscape</field>
      <field name="margin_top">5</field>
      <field name="margin_bottom">15</field>
      <field name="header_spacing">5</field>
    </record>

    <record id="action_report_purchase_requisitions" model="ir.actions.report.xml">
      <field name="paperformat_id" ref="paperformat_bid_selection"/>
    </record>

  </data>
</openerp>

Add some spacing to avoid table being overlapped by header
Add some spacing to avoid table being overlapped by header
