<record id="res_partner_endo_sys_info" model="ir.ui.view">
<field name="name">res.partner.sys.info</field>
<field name="model">res.partner</field>
<field name="inherit_id" ref="crm_sys_info.res_partner_sys_info" />
<field name="priority" eval="20"/>
<field name="view_type">tree</field>
<field name="arch" type="xml">
<xpath expr="//field[@name='room_lines']" position="replace">
<field name="room_lines" nolabel="1" editable="bottom" widget="twotomany" position ="replace" >
<form string="Room" version="7.0" position ="replace">
<group>
<group>
<field name="name" position ="replace"/>
<field name="remote_conn_room" placeholder="Put Remote connection details here..." colspan="4" position ="replace" />
</group>
</group>
<group col="6" colspan="2" string="Speciality" position ="replace" >
<field name="licensce_lines" widget="one2many" nolabel="1" position ="replace">
<tree string="License" editable="bottom" colors="red:deactive == True ;red:support_end < current_date" position ="replace">
<field name="name" position ="replace"/>
<field name="exe_version" position ="replace"/>
<field name="comp_name" position ="replace"/>
<field name="lic_name" invisible="1" position ="replace"/>
<field name="installed_date" position ="replace"/>
<field name="support_start" position ="replace"/>
<field name="support_end" position ="replace"/>
<field name="comments" position ="replace"/>
<field name="deactive" position ="replace"/>
</tree>
</field>
</group>
<group col="6" colspan="2" string="Cables" position ="replace" >
<field name="cableing_lines" widget="one2many" position ="replace" nolabel="1">
<tree string="Cables" editable="bottom" position ="replace">
<field name="name" position ="replace"/>
<field name="serial_num" position ="replace"/>
<field name="cable_length" position ="replace"/>
<field name="installed_date" position ="replace"/>
<field name="comments" position ="replace"/>
</tree>
</field>
</group>
<group col="6" colspan="2" string="Custom Cabling" position ="replace" >
<field name="cust_cable_lines" widget="one2many" nolabel="1" position ="replace">
<tree string="Custom Cables" editable="bottom" position ="replace">
<field name="name" position ="replace"/>
<field name="length" position ="replace"/>
<field name="communication" position ="replace"/>
<field name="comments" position ="replace"/>
</tree>
</field>
</group>
<group col="6" colspan="2" string="Video Processors" position ="replace">
<field name="video_process_lines" widget="one2many" nolabel="1" position ="replace">
<tree string="Video Processors" editable="bottom" position ="replace">
<field name="name" position ="replace"/>
<field name="type_id" position ="replace"/>
<field name="comm_id" position ="replace"/>
<field name="comments" position ="replace"/>
</tree>
</field>
</group>
<group col="6" colspan="2" string="Other Equipment" position ="replace" >
<field name="other_equp_lines" widget="one2many" nolabel="1" position ="replace">
<tree string="Other Equipment" editable="bottom" position ="replace">
<field name="name" position ="replace"/>
<field name="type_id" position ="replace"/>
<field name="comm_id" position ="replace"/>
<field name="comments" position ="replace"/>
</tree>
</field>
</group>
<group col="6" colspan="2" string="Additional Notes" position ="replace">
<field name="notes" placeholder="Put additional notes on the room.." position ="replace"/>
</group>
</form>
</field>
</xpath>
</field>
</record>
No need to write position='replace' in all fields, in xpath only its enough