<unbound method account.invoice.line.on_change_account>
Traceback (most recent call last):
File "/dist-packages/trytond/wsgi.py", line 47, in dispatch_request
return endpoint(request, **request.view_args)
File "/dist-packages/trytond/protocols/dispatcher.py", line 41, in rpc
request, database_name, *request.rpc_params)
File "/dist-packages/trytond/wsgi.py", line 39, in auth_required
return wrapped(*args, **kwargs)
File "/dist-packages/trytond/protocols/wrappers.py", line 107, in wrapper
return func(request, pool, *args, **kwargs)
File "/dist-packages/trytond/protocols/dispatcher.py", line 165, in _dispatch
result = rpc.result(meth(inst, *c_args, **c_kwargs))
File "/dist-packages/trytond/model/modelview.py", line 675, in on_change
method()
File "/dist-packages/trytond/model/modelview.py", line 83, in wrapper
assert result is None, func
AssertionError: _account>