If an invoice definition is not used, and never will be used, you should delete it.
In the Invoice definitions dialog, right-click the invoice definition and click Delete.
In the Invoice definitions dialog, right-click any invoice definition and click Select all. This selects all items in the list. Or, hold down the Shift key or Ctrl and left-click each desired invoice definition. This selects specific invoice definitions.
Right-click any selected invoice definition and click Delete to delete all selected items.
The supplier for the invoice definition is also deleted.
You can also delete invoice definitions that meet different criteria using a maintenance plan.
If the system contains invoices corresponding to the deleted invoice definitions, those invoices are given the invoice status Scanned.
There are a couple of additional steps when deleting XML invoice definitions.