Click the Commercial Menu item up top
Click on the customer name
Click "Show Customer preview" (Located top right hand side under the customer tab)
Click on the payment in question
Click delete (This will also remove it from the account you processed the payment into)
Click the Commercial Menu item again
Click on the customer name
Click on the invoice in question
Click Modify
This will return it to draft status
Let me know if this helps or if you need screenshots
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