NZ Customs have advised that a Location of Goods code will be mandatory on Export Entries from June 2nd 2020. More information here.
In Prodoc version 3.7.18 (first release of 2020) we added logic to send the Load Port Code as the Location of Goods unless another Location of Goods is specified. Prior to that we would only send Location of Goods where a shipment was air freight and had a forwarder selected.
If your version of Prodoc is below 3.7.18 (hover over the Prodoc logo in the Home Screen to see) you should arrange an update by contacting email@example.com before June.
If you are already on a more recent version of Prodoc you can find out how to set Location of Goods codes up here.