If you and your customer have agreed a new due date for a sales invoice, you can run the Modify sales invoice due date process to change the due date on the Sales invoices form. The Due date field can only be changed using this process.

The process also adjusts the due date in the journal entry relating to the sales invoice. Once the journal entry has been exported to the financial application, the due date can no longer be modified. If you are using Isah Finance, the Change sales invoice due date process is not available, because any journal entries created are immediately added to the financial database of Isah Finance. You can change the due date from within Isah Finance.