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Yes, we can change the paid invoices and associate it to a project. Here's how we can do it:
The payment will be unattached from the invoice. This will show as Unapplied. Here's how to move and link it to the invoice:
You might want to be careful next time to avoid creating unnecessary invoices and payments to the different customers. This should save your time from correcting those transactions again.
You can always get back to us if you have additional questions.