I received an error 'INV AMOUNT MUST BE ENTERED IF PG/LN NO ARE ENTERED'. What does it mean?

I received an error 'INV AMOUNT MUST BE ENTERED IF PG/LN NO ARE ENTERED'. What does it mean?

If the value is 0 should fall under some category like Gift or Promotional items, and that would not be with IID.

User cannot declare them using IID and not LVS as well. User can contact CBSA and ask for compliance advice if they already don't know what the procedure or category of the shipment would be or fall under.