atw: Caption placement

Hi
 
The 'house' style of my current workplace dictates captions in documents
are placed above a table and below a figure / graphic. I have come
across this in a couple of other organisations I have worked for.
 
Does anybody know the history and/or reasoning behind this? I cannot
seem to find any references for caption placement in the Commonwealth
Style Manual.
 
As always, thanks in advance Austechies!!
 
Cheers
Debbie

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