Traceback (most recent call last):
File "/trytond/wsgi.py", line 111, in dispatch_request
return endpoint(request, request.view_args)
File "/trytond/protocols/dispatcher.py", line 48, in rpc
request, database_name, request.rpc_params)
File "/trytond/wsgi.py", line 78, in auth_required
return wrapped(args, kwargs)
File "/trytond/protocols/wrappers.py", line 131, in wrapper
return func(request, pool, *args, kwargs)
File "/trytond/protocols/dispatcher.py", line 181, in _dispatch
result = rpc.result(meth(*c_args, *c_kwargs))
File "/trytond/wizard/wizard.py", line 314, in execute
return wizard._execute(state_name)
File "/trytond/wizard/wizard.py", line 340, in _execute
do_result = do(action)
File "/trytond/modules/purchase/purchase.py", line 1983, in doreturn
Purchase.save(return_purchases)
File "/trytond/model/descriptors.py", line 33, in newfunc
return self.func(owner, args, kwargs)
File "/trytond/model/modelstorage.py", line 1734, in save
(([r], save_values[r]) for r in to_write), ()))
File "/trytond/model/modelsql.py", line 159, in wrapper
return func(cls, *args, **kwargs)
File "/trytond/model/modelsql.py", line 977, in write
all_ids, 'write', nodomain='ir.msg_write_error')
File "/trytond/model/modelsql.py", line 1223, in __check_domain_rule
wrong_ids = test_domain(ids, domain)
File "/trytond/model/modelsql.py", line 1199, in test_domain
domain, active_test=False, tables=tables)
File "/trytond/model/modelsql.py", line 1428, in search_domain
domain = cls._search_domain_active(domain, active_test=active_test)
File "/trytond/model/modelstorage.py", line 515, in _search_domain_active
if not ('active' in cls._fields
AttributeError: type object 'purchase.purchase' has no attribute '_fields'

Fault: type object 'purchase.purchase' has no attribute '_fields'