Certification question
 

I applied for a family sponsored 176 in Oct but gained SS last week for a different occupation and will have to withdraw my current application and submit a new one.
I have a number of black and white documents that were certified in Oct. Will I have to have the documents certified again or will the date not matter?
I have tried searching the forum and on the immi website but can't find any information.

Does anyone have any ideas?

Thanks Sue