Unpaid sales invoices in a vat return

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Hi,

Thank you in advance for any help you can give on this matter.

I have noticed that my invoices that have not been paid yet are being included in my vat return.

When I go to "customer receipts" and type in my customer, the list of unpaid invoices come up, but some of the invoices that are on this list of unpaid invoices have been included in my previous vat return, which has already been submitted.

To double check this, I go to the actual invoice in "Sales" and when the invoice is opened and displaced, it states its still unpaid, so I don't know the reason why its being included in my previous submitted vat return. I've check my vat scheme and it states "Cash Accounting Scheme" I've tried to looked on the Sage Help and googled it but I just cant seem to find a answer.