Invoice sources
You can use these invoice sources within the Billing application:
- Manually-entered invoices
 - Interfaced from an outside source
 - Shipment-related, created in the Order Entry application
 - Recurring invoice
 - Customer returns, credit memo from the Order Entry application
 - Activity, created in the Project Accounting application
 
When creating invoices, you can use the Billing application to assign a value to each invoice and indicate the source.
This table shows the values in each invoice source:
| Value | Invoice Source | 
|---|---|
| M | Manually created invoice | 
| I | Interfaced invoice | 
| S | Shipment-related invoice | 
| C | Recurring invoice | 
| R | Credit memo created from a return | 
| A | Invoice created in the Project Accounting application | 
Category of invoices
Invoices are categorized into debit and credit memos. This table shows the invoice category for each type of invoice:
| Invoice category | Type of invoice | 
|---|---|
| Debit memo | Shipment-related invoices | 
| Interfaced invoices | |
| Manually entered invoices | |
| Recurring invoices | |
| Credit memo | Credit memos | 
| Credit memos created from returns | 
Regardless of how you create an invoice, all invoices go through some part of the invoicing process. You process them individually, in batches, or both.