Thanks for the comments everyone. I spoke to SARS via my client yesterday as they were in a meeting at SARS icw this and several other issues they're having (that thankfully have nothing to do with me). I asked whether they should submit a request for a correction of the VAT return 2013/08 - she answered 'no'. So I asked if I should pass credit notes for the invoice processed in August 2013 and re-enter the invoices in the current VAT period and she said 'no'. So I asked what it was I should do and she said 'adjust the next VAT return'; so I asked whether she meant I should do a manual adjustment to the next return and she answered 'no'.
So I've learned two things, SARS (in my humble opinion) doesn't know what they're talking about and her favourite word is 'no'.
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