ProgrammingError: operator does not exist: integer = boolean

[Maxime Chambreuil (http://www.savoirfairelinux.com)]

When creating an hr expense line without product, I get:

OpenERP Server Error

Client Traceback (most recent call last):
File "/opt/home/openerp/src/bzr/web/addons/web/common/http.py", line 180, in dispatch
response["result"] = method(controller, self, **self.params)
File "/opt/home/openerp/src/bzr/web/addons/web/controllers/main.py", line 976, in save
r = m.write([id], data, req.session.eval_context(req.context))
File "/opt/home/openerp/src/bzr/web/addons/web/common/openerplib/main.py", line 250, in proxy
args, kw)
File "/opt/home/openerp/src/bzr/web/addons/web/common/openerplib/main.py", line 117, in proxy
result = self.connector.send(self.service_name, method, *args)
File "/opt/home/openerp/src/bzr/web/addons/web/common/http.py", line 608, in send
raise xmlrpclib.Fault(openerp.tools.exception_to_unicode(e), formatted_info)

Server Traceback (most recent call last):
File "/opt/home/openerp/src/bzr/web/addons/web/common/http.py", line 593, in send
return openerp.netsvc.dispatch_rpc(service_name, method, args)
File "/opt/home/openerp/src/bzr/server/openerp/netsvc.py", line 360, in dispatch_rpc
result = ExportService.getService(service_name).dispatch(method, params)
File "/opt/home/openerp/src/bzr/server/openerp/service/web_services.py", line 586, in dispatch
res = fn(db, uid, *params)
File "/opt/home/openerp/src/bzr/server/openerp/osv/osv.py", line 186, in execute_kw
return self.execute(db, uid, obj, method, *args, **kw or {})
File "/opt/home/openerp/src/bzr/server/openerp/osv/osv.py", line 129, in wrapper
return f(self, dbname, *args, **kwargs)
File "/opt/home/openerp/src/bzr/server/openerp/osv/osv.py", line 195, in execute
res = self.execute_cr(cr, uid, obj, method, *args, **kw)
File "/opt/home/openerp/src/bzr/addons/audittrail/audittrail.py", line 503, in execute_cr
return fct_src(cr, uid, model, method, *args)
File "/opt/home/openerp/src/bzr/server/openerp/osv/osv.py", line 183, in execute_cr
return getattr(object, method)(cr, uid, *args, **kw)
File "/opt/home/openerp/src/bzr/server/openerp/osv/orm.py", line 3955, in write
result += self._columns[field].set(cr, self, id, field, vals[field], user, context=rel_context) or []
File "/opt/home/openerp/src/bzr/server/openerp/osv/fields.py", line 572, in set
id_new = obj.create(cr, user, act[2], context=context)
File "/opt/home/openerp/src/bzr/accountedge/hr_expense_line_supplier_tax/hr_expense_line_supplier_tax.py", line 60, in create
vals['tax_id'] = self.get_tax_id(cr, user, vals['product_id'], vals['partner_id'], context)
File "/opt/home/openerp/src/bzr/accountedge/hr_expense_line_supplier_tax/hr_expense_line_supplier_tax.py", line 34, in get_tax_id
purch_tax = product.product_tmpl_id.supplier_taxes_id
File "/opt/home/openerp/src/bzr/server/openerp/osv/orm.py", line 476, in __getattr__
return self[name]
File "/opt/home/openerp/src/bzr/server/openerp/osv/orm.py", line 391, in __getitem__
field_values = self._table.read(self._cr, self._uid, ids, field_names, context=self._context, load="_classic_write")
File "/opt/home/openerp/src/bzr/server/openerp/osv/orm.py", line 3416, in read
result = self._read_flat(cr, user, select, fields, context, load)
File "/opt/home/openerp/src/bzr/server/openerp/osv/orm.py", line 3475, in _read_flat
cr.execute(query, (tuple(sub_ids),))
File "/opt/home/openerp/src/bzr/server/openerp/sql_db.py", line 152, in wrapper
return f(self, *args, **kwargs)
File "/opt/home/openerp/src/bzr/server/openerp/sql_db.py", line 212, in execute
res = self._obj.execute(query, params)
ProgrammingError: operator does not exist: integer = boolean
LINE 1: ...d FROM "product_product" WHERE product_product.id IN (false)...
^
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts.