Invoice # can only be numerical!!! LOL

Hi there. Let us provide insights about the invoice number in QuickBooks Online (QBO).

When making an invoice, you can assign it as a numerical or alphabetical identifier. It is important to note that if you choose to use a letter as the identifier, it will not automatically apply to the next invoice you create. In other words, if you use "A" as the identifier for your first invoice, the system will not automatically assign "B" to the next invoice. Therefore, you'll manually enter the desired identifier for each invoice. We'll show you how to edit invoice number:

1. In Sales, select Invoices.
2. Choose any invoice, then select Edit invoice. Otherwise, click Create invoice to create a new invoice.
3. Go to the Invoice no. field and enter the custom number or letter sequence you want to use for your forms. 
4. If done, hit Save or Save and close.

You can turn off custom transaction numbers in Account and Settings if you prefer a manually entering invoice number. Here's how:

1. In Settings, select Account and Settings.
2. Choose Sales.
3. From the Sales form content, click Edit ✎.
4. Turn Custom transaction numbers off.
5. Click Save, then select Done.

Visit this article for further guidance in personalizing your invoice in QBO: Customize invoices, estimates, and sales receipts in QuickBooks Online. 

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