You can use the Prepayment handlingform to change the VAT posting in posted customer payments. The Prepayment handlingform allows you to do the following:
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Convert a prepayment to a payment.
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Convert a payment to a prepayment.
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Change the payment posting date.
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Change the tax amount.
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Change the tax rate, which includes incorporating several taxes with different rates for one prepayment.
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Click Accounts receivable> Common Forms> Customer Details.
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Select a customer account, and click Transactions.
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Click Prepayment handlingto open the Convert to prepaymentform, and then make changes to payments and prepayments.
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Click Postto post the transaction.