When I converted the CDT-pollingChannel-v2_7_0.xsd to the corresponding TTCN-3 types, I realized that pollingChannelURI attribute was removed. But checking TS-0001 v2.10.0 and TS-0004 v2.17.1, I have seen that pollingChannelURI is still there but as a child resource. It seems to me that such child resource has not been added into the corresponding XSD file.