Hi JoanneSweno
Thank you for your response.
Could you please try checking your invoice if it is still showing as open in the open invoices fields. I would recommend to settle the credit for the first over payments and process refund. Then try to apply the other overpayments to the same invoice. This should be showing once you ticked the include closed invoice.
Please feel free to post again I'm happy to assist.
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Cheers,
Princess