Any changes in the Grace period of Late Payment Interest will not be effective on the generated invoices. The due date has to be changed in generated invoices also.
Changing the due date for invoices can very much be done at your end.
Note: By default, access to the ‘Bulk Corrections’ tab is provided only to ADDA Moderator.
Moderator can share these rights with other admins also (through ‘Control Access for Bulk Corrections’).