Hi chouchouu, that's my understanding.
We are planning on taking this up this year now that the rule change allows us. One of our employers short changes their staff by using the salary sacrificed super contributions to reduce their own :( I really wish they would hurry up and close this loophole. We are doing exactly what mjr suggested.
I even made up a excel spreadsheet to calculate everything but you could just use the online moneysmart one and save yourself some time!
The process looks easy to me. Make your contributions, fill in the notice of intent form, send it to your super provider (either at the EOF or before you do your tax, whichever is earliest), make sure you get written confirmation from your super provider. Make the claim when you do your tax.