In PortMapping, the mapping corresponding to a traffic port of a Transponder is not always filled with the xpdr-node-types value "tpdr", as it is made with values mpdr or switch for an otn-xpdr.
Having always this field with the correct value in PortMapping datastore could simplify downstream treatments, as for example in T-API topology management.
Fill systematically this field whatever is the xpdr node type.