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Problem: I need to change the number of an invoice, but the Invoice No. field is inactive.

Note
You can’t change the number of an invoice for which a credit note was issued.

Solution:

To revert the invoice’s status, open the invoice page in edit mode and click the arrow in the Invoice Status field.

Info
Switching statuses for Sent invoices may be forbidden in the Configuration menu > Clients and Vendors > Client Settings > Invoicingtab.

Note
If the invoice is in the Sent status, don’t forget to resend the invoice to your client after you change the invoice number. To do so, revert the status back to Ready and click the Send by E-mail or Edit and Send buttons that appear in the Type section.

Info
Invoice numbers are assigned according to a numbering scheme. To change the default numbering scheme, go to the Configuration menu > Templates > Numbering Schemes. Here you can edit the Client invoice numbering scheme or add a new one of the same type. To learn how to do that, see the Templates - Numbering Schemes article.

To do so, perform the following steps:

Go to the Configuration menu > Clients and Vendors > Client Settings > Invoicing tab.
Check the Enable Invoice Number Modification box.
Click the Save button.

Now you can go back to the invoice in question and change the invoice number.