Duplicate previously Posted Invoices and Notes to save time. 

Find the required Invoice, duplicate it, give it a new Number, and make changes, for example to Dates and Prices, or add and delete Lines.

See:

Purchase Item Invoice (4.2) - AIQ Academy

Edit and Credit Purchase Item Invoice (4.3) - AIQ Academy

Sales Item Invoices / Credit notes (3.2) - AIQ Academy

Creating Purchase Item Credit Notes‍ 

Creating Sales Item Credit Notes 

Creating Purchase Item Invoices 

Creating Sales Item Invoices 

1. Go to Sales or Purchases > Item Invoices.
2. Only Posted Invoices can be duplicated, so set Current Filter to Posted Invoices/Notes and find the relevant Invoice/Note.
3. Under Actions, select Duplicate.
4. In the new Invoice/Note the date will default to today. Refer to Creating Sales Item Invoices or Creating Purchase Invoices (Non PO Process) for more details on specific fields. Enter an Invoice/Note number and make any edits needed, including:
   • Adjust Quantities. 
   • Update Unit Prices. If Unit Prices have changed since posting the original Invoice, these will not show here so you must manually update them.
   • Add and delete Lines. 
5. When finished, click Save. When asked if you want to process the record, click OK.
6. When the invoice is approved (if using), it can be posted as normal. Select it in the grid, then go to Post > Post Selected.