According to section 6.2.3.1 of IFA014: > "A Sapd inherits from the corresponding Cpd Class [...] All attributes of the Cpd are also attributes of the Sapd" These attributes are specified on section 7.1.6.3 of IFA011 and include a description, the layer protocol, the CpProtocolData, the trunkMode and the id of a security group rule. However, these attributes seem to be missing on the [SAPD YANG definition](https://forge.etsi.org/rep/nfv/SOL006/blob/dev-v3.4.1/src/yang/etsi-nfv-ns.yang#L167) so they cannot be specified at the NSD level.