System Variable 787: Enable Manual Sales Invoices Payment Status Change

Use this System Variable to determine if manually changing the payment status of Sales Invoices should be enabled.

This System Variable is disabled by default. When it is enabled, you can manually change the payment status of a Sales Invoice from unpaid to paid and back. If it is not enabled and you try to manually change the payment status of a Sales Invoice, you will be prompted with the following error message:
You cannot change payment status. Please check system variable 787.
Note: It is not advisable to enable this System Variable when using the WorkBook Finance module and when managing sales receipts in the Debtors module.