QuickBooks: Creating a Missing and Duplicate Invoice Number Report
Most companies have some control over the process of creating customer invoices. One control, especially if invoices are created manually in the field and later entered into QuickBooks, is to maintain a numeric invoicing pattern. This method of invoice recordkeeping can be an important process to have if your company is ever audited and you are required to provide a list of all invoices.
To see whether your data has any missing numbers in the invoicing sequence, follow these steps:
Click Reports, Banking, Missing Checks.
In the next screen, choose Accounts Receivable from the drop-down menu.
It is also recommended to rename the report by choosing Modify Report, clicking the Header/Footer tab and typing a new title for the Report Title field, such as Missing Invoices.