Magento checkout duplicated invoice ID error

In Magento checkout page, a customer try to checkout, after clicked the Continue button at Payment information and seeing this error:
"PayPal Gateway has rejected request. Payment has already been made for this InvoiceID (#10412 Duplicated invoice)."

Why this would happen and how to fix this?
Boon Chye PhangAsked:
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Iamthecreator OMIT Admin/EE Solution GuideCommented:
To resolve the problem, allow multiple payments per invoice ID in PayPal's Payment Receiving Preferences. After that, PayPal accepts payments with no error messages — even for invoices with duplicate IDs.
More information can be found here

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Boon Chye PhangAuthor Commented:
Thanks it is solved!
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