Hi,

I am trying to add new menu item under sales menu and i want it to appear after sales order. however, i am stuck with external id not found error. following is odoo-server file content. i had created module named "custom" and put inside odoo10-server/addons folder.

addons_path = /usr/lib/python2.7/dist-packages/odoo/addons
[options]logfile = /var/log/odoo10/odoo10-server.log
addons_path=/odoo10/odoo10-server/addons,/odoo10/custom/addons
xmlrpc_port = 8010

ParseError: "External ID not found in the system: base.menu_sales" while parsing /odoo10/odoo10-server/addons/custom/views/custom_view.xml:7, near
<menuitem id="menu_sub_sales_menu_item" name="Menuitem" parent="base.menu_sales"/>