You have the option of declaring a total or partial collection on an issued invoice:

1. Click on the Customer Invoices tab.
    
2. Select Customer Invoice Tracking .
    
3. Open the relevant invoice.
    
4. At the very bottom, tap Report a Collection .
    
5. Enter the amount collected (total or partial).
    
6. Indicate the collection date.
    
7. Press Validate .
    

The functional status of the invoice will change from Issued to Collected .