If the invoice is linked to an order with a payment plan, the heading Partial invoice will be displayed to the right of the heading Partial invoice. Below this heading you will see the partial invoice type, that is Advance, Delivery or Subsequent.
If you have activated the setting Code suspended input VAT when registering advance invoices, under Payment plans under the Purchase tab in the Settings procedure, the system will automatically make entries on the accounts Suspended Input VAT and Input VAT. This is done in order to have the VAT reported in connection with the payment of the invoice.