GST Refund Posting Question

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Good Day,

I had to file my last quarter (Oct - Dec /17) GST remittance during a period I was without my PC (and Sage) as we had serious crash and PC had to go to a lab for data retrieval.  I had to calculate the remittance manually and inadvertently included sales and purchases for Sept/17.  Once PC back and I went to post it I realized what I had done wrong and I filed an adjustment for the period as both revenue and input credits were wrong and that resulted in a refund.

So I normally post both remittances/refunds in Vendor Payment - Make other Payment to CRA and it breaks it down to acct 2310 charged on sales and 2315 paid on purchases, so how should I post this refund given I already posted the original remittance as the payment amount is in fact what was submitted to CRA.

Correct me if I am wrong but I can't just adjust the original remittance as the payment did come out of the bank and now I have a deposit for the refund? 

Thank you,

Wendy