I am trying to inherit osv_memory class:

mrp_bom.py

class mrp_config_settings(osv.osv_memory):
    _inherit = 'mrp.config.settings'

    _columns = {
        'bom_sequence': fields.boolean('Bom Sequence'),
    } 

mrp_bom_view.xml

<record id="view_mrp_config_bom_sequence" model="ir.ui.view">
        <field name="name">view_mrp_config_bom_sequence</field>
        <field name="model">mrp.bom</field>
        <field name="inherit_id" ref="mrp.view_mrp_config"/>
            <field name="arch" type="xml">
                <xpath expr="//separator[@string='Manufacturing Order']" position="after">
                    <label for="id" string="Bom"/>
                    <div>
                        <div>
                            <field name="bom_sequence"  class="oe_inline"/>
                            <label for="bom_sequence"/>
                        </div>
                    </div>
                </xpath>
            </field>
    </record> 

I am constanly getting an error on a field that is not even in my view but as far as I can see is included in server basic mrp res_config.xml and res_config.py

'View error', u"Can't find field 'module_mrp_repair' in the following view parts composing the view of object model 'mrp.config.settings':\n * mrp settings\n * view_mrp_config_bom_sequence

Why would it throw error eventhough I didn't touch the field?