Hello, I'm trying desperately to assign a product a supplier. Unfortunately, I get the following message: File "C:\Program Files (x86)\OpenERP\Server\server\openerp\addons\web\session.py", line 103, in send

Server Traceback (most recent call last): File "C:\Program Files (x86)\OpenERP\Server\server\openerp\addons\web\session.py", line 89, in send File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\netsvc.py", line 292, in dispatch_rpc File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\service\web_services.py", line 626, in dispatch File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\osv\osv.py", line 131, in wrapper File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\osv\osv.py", line 220, in exec_workflow File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\osv\osv.py", line 213, in exec_workflow_cr File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\osv\orm.py", line 3928, in _workflow_signal File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\wkf_service.py", line 119, in trg_validate File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\instance.py", line 43, in validate File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 60, in process File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 175, in _split_test File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 183, in _join_test File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 40, in create File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 60, in process File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 175, in _split_test File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 183, in _join_test File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 40, in create File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 60, in process File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 175, in _split_test File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 183, in _join_test File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 40, in create File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 60, in process File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 175, in _split_test File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 183, in _join_test File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 40, in create File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 52, in process File "C:\Program Files (x86)\OpenERP\Server\server.\openerp\workflow\workitem.py", line 133, in _execute TypeError: 'NoneType' object is unsubscriptable