Hello,

We have a strange issue when we change the state of an invoice or quotation to draft => send.

Odoo origine/8.0 

Traceback (most recent call last):

 File "/home/odoo/odoo/openerp/http.py", line 537, in _handle_exception 
 return super(JsonRequest, self)._handle_exception(exception) 
 File "/home/odoo/odoo/openerp/http.py", line 574, in dispatch 
 result = self._call_function(**self.params) 
 File "/home/odoo/odoo/openerp/http.py", line 310, in _call_function 
 return checked_call(self.db, *args, **kwargs) 
 File "/home/odoo/odoo/openerp/service/model.py", line 113, in wrapper 
 return f(dbname, *args, **kwargs) 
 File "/home/odoo/odoo/openerp/http.py", line 307, in checked_call 
 return self.endpoint(*a, **kw) 
 File "/home/odoo/odoo/openerp/http.py", line 803, in __call__ 
 return self.method(*args, **kw) 
 File "/home/odoo/odoo/openerp/http.py", line 403, in response_wrap 
 response = f(*args, **kw) 
 File "/home/odoo/odoo/addons/web/controllers/main.py", line 948, in call_kw 
 return self._call_kw(model, method, args, kwargs) 
 File "/home/odoo/odoo/addons/web/controllers/main.py", line 940, in _call_kw 
 return checked_call(request.db, *args, **kwargs) 
 File "/home/odoo/odoo/openerp/service/model.py", line 113, in wrapper 
 return f(dbname, *args, **kwargs) 
 File "/home/odoo/odoo/addons/web/controllers/main.py", line 939, in checked_call 
 return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs) 
 File "/home/odoo/odoo/openerp/api.py", line 241, in wrapper 
 return old_api(self, *args, **kwargs) 
 File "/home/odoo/odoo/openerp/models.py", line 3143, in read 
 result = BaseModel.read(records, fields, load=load) 
 File "/home/odoo/odoo/openerp/api.py", line 239, in wrapper 
 return new_api(self, *args, **kwargs) 
 File "/home/odoo/odoo/openerp/models.py", line 3178, in read 
 self._read_from_database(stored, inherited) 
 File "/home/odoo/odoo/openerp/api.py", line 239, in wrapper 
 return new_api(self, *args, **kwargs) 
 File "/home/odoo/odoo/openerp/models.py", line 3357, in _read_from_database 
 res2 = self._columns[f].get(cr, self._model, ids, f, user, context=context, values=result) 
 File "/home/odoo/odoo/openerp/osv/fields.py", line 1454, in get 
 result = self._fnct(obj, cr, uid, ids, name, self._arg, context) 
 File "/home/odoo/odoo/addons/portal_sale/portal_sale.py", line 91, in <lambda> 
 _payment_block_proxy = lambda self, *a, **kw: self._portal_payment_block(*a, **kw) 
 File "/home/odoo/odoo/openerp/api.py", line 241, in wrapper 
 return old_api(self, *args, **kwargs) 
 File "/home/odoo/odoo/addons/portal_sale/portal_sale.py", line 104, in _portal_payment_block 
 partner_id=this.partner_id.id, company_id=this.company_id.id, context=context) 
 File "/home/odoo/odoo/openerp/api.py", line 241, in wrapper 
 return old_api(self, *args, **kwargs) 
 File "/home/odoo/odoo/addons/payment/models/payment_acquirer.py", line 299, in render_payment_block 
 context) 
 File "/home/odoo/odoo/openerp/api.py", line 241, in wrapper 
 return old_api(self, *args, **kwargs) 
 File "/home/odoo/odoo/addons/payment/models/payment_acquirer.py", line 271, in render 
 return self.pool['ir.ui.view'].render(cr, uid, acquirer.view_template_id.xml_id, qweb_context, engine='ir.qweb', context=context) 
 File "/home/odoo/odoo/openerp/api.py", line 241, in wrapper 
 return old_api(self, *args, **kwargs) 
 File "/home/odoo/odoo/addons/website/models/ir_ui_view.py", line 172, in render 
 return super(view, self).render(cr, uid, id_or_xml_id, values=values, engine=engine, context=context) 
 File "/home/odoo/odoo/openerp/api.py", line 241, in wrapper 
 return old_api(self, *args, **kwargs) 
 File "/home/odoo/odoo/openerp/addons/base/ir/ir_ui_view.py", line 1017, in render 
 return self.pool[engine].render(cr, uid, id_or_xml_id, qcontext, loader=loader, context=context) 
 File "/home/odoo/odoo/openerp/api.py", line 241, in wrapper 
 return old_api(self, *args, **kwargs) 
 File "/home/odoo/odoo/openerp/addons/base/ir/ir_qweb.py", line 262, in render 
 return self.render_node(self.get_template(id_or_xml_id, qwebcontext), qwebcontext) 
 File "/home/odoo/odoo/openerp/addons/base/ir/ir_qweb.py", line 193, in get_template 
 raise_qweb_exception(QWebTemplateNotFound, message="Loader could not find template %r" % name, template=origin_template) 
 File "/home/odoo/odoo/openerp/addons/base/ir/ir_qweb.py", line 191, in get_template 
 xml_doc = qwebcontext.loader(name) 
 File "/home/odoo/odoo/openerp/addons/base/ir/ir_ui_view.py", line 1015, in loader 
 return self.read_template(cr, uid, name, context=context) 
 File "/home/odoo/odoo/openerp/api.py", line 241, in wrapper 
 return old_api(self, *args, **kwargs) 
 File "<string>", line 2, in read_template 
 File "/home/odoo/odoo/openerp/tools/cache.py", line 122, in lookup 
 value = d[key] = self.method(*args, **kwargs) 
 File "/home/odoo/odoo/openerp/addons/base/ir/ir_ui_view.py", line 844, in read_template 
 raise ValueError('Invalid template id: %r' % (xml_id,)) 
QWebTemplateNotFound: Invalid template id: u''

Are anyone able to help us debuging this issue please? Thank you