We had our trouble with entering user materials into the database. After some testing and correspondence I made summary "help" document so we do not forget what we learned. You can get it from

http://www.jat.co.za/download/MaterialDatabase.pdf

If you have answers to the outstanding issues, have additional information or note a mistake please post the comments. Alternatively you can show up at: S 26 deg 07.26', E 27 deg 54.93' and we can have a drink over the issues