An Invoice with Payments allocated to it cannot be Voided. To Void an Invoice with Payment Allocations, you must first remove the Payments.
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Find the Invoice with the Allocated Payments.
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Click the Eye Icon on the right of the Invoice to view it's details.
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Under Allocations & Credit Notes, click the Invoice Number Link.
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Scroll down to Payment Allocations.
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Unclick the selected invoice, checked in blue.
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Once you've removed the Payment Allocation, click Allocate to Save the changes.
This will allow you to void the Invoice or allocate the Payment to a different Invoice.