The description of intCp attribute of ExtManagedVirtualLinkData data type says: "This attribute may only be present if the "netAttDefResourceData" is also present." Currently, the Open API Specification does not support the attribute dependency as reported in this issue: https://github.com/OAI/OpenAPI-Specification/issues/256. However, a possible solution is to use an "intermediate" data type called, for instance, _VnfcConnectionInfo_ that contains two attributes, i.e., netAttDefResourceData (mandatory) and intCp (optional). This _VnfcConnectionInfo_ "intermediate" data type would be then included as an optional attribute in the ExtManagedVirtualLinkData data type, resolving the problem of the attribute dependency. On the other hand, this solution would make the ExtManagedVirtualLinkData, not in compliance with the SOL005ed431 specification.