The Exclude Dormant Suppliers filter in the PL Insurance/Schemes Workbench runs from the detail in the Suppliers Insurance tab.
To set the insurance scheme to Dormant, please follow the steps below:
Go to Purchase Ledger
Select Suppliers
Search for the Supplier
Click Open folder icon
Go to the Insurance tab
Click Open on the Insurance Scheme
Tick the Dormant box
Click Save
The supplier will now be excluded from the list in the PL Insurance/Schemes Workbench when filtering out Dormant Suppliers.