I am trying to make a webservice SOAP call to OTRS v5.6
I have configured webservice : GenericConfigItemConnectorSOAP

I am calling as superuser or as root@localhost
I have checked the class is having permission for itsm-configitem

And super user is also having permission r/w to itsm-configitem

But when i try to call got return :
<ErrorCode>ConfigItemGet.AccessDenied</ErrorCode><ErrorMessage>ConfigItemGet: Can not get configuration item!</ErrorMessage>
I think i have setup the permission to rw , but still got error. Other user that having rw to itsm-configitem also having error.
If i login ot OTRS portal, i can see the config item there.
Any thing i missed? Please kindly help