Assigning the Next Invoice Number
You can reserve the invoice number that will be used the next time that you generate invoices. You use the Assign Invoice Number feature to reserve the next invoice number.
The number that you specify is used for the next invoice generated for the currently opened project, or for the entire company, depending on whether your company uses a per project or company-wide invoice Numbering Method (established on the General tab of Billing Setup).
You must belong to a role with the proper access rights to assign invoice numbers (Interactive Billing Allow Final Processing).
If you select the Print Assigned Invoice Number option on the Billing Setup form and an invoice number is pre-assigned on this form, then the assigned invoice number prints in the Invoice Block, on subsequent page headers of the invoice, and in the Billing Backup report, when draft invoices are generated. The invoice number prints whether or not the project and invoice number are printed on separate lines or combined into one line.