Had the same issue, turns out that oemedical_lab_view extends oemedical_menu... but oemedical_menu is loaded AFTER oemedical_lab_view, so it does not exist yet.
You need to fix addons/oemedical/__openerp__.py
Put 'oemedical_menu.xml' in data section just before oemedical_lab_view.xml
Had the same issue, turns out that oemedical_lab_view extends oemedical_menu... but oemedical_menu is loaded AFTER oemedical_lab_view, so it does not exist yet.
You need to fix addons/ oemedical/ __openerp_ _.py
Put 'oemedical_ menu.xml' in data section just before oemedical_ lab_view. xml
I've attached a patch that fixes it.