To make an invoice with excess and / or vat deductibility, you first choose the estimate you want to invoice and then click on  the invoice button

After confirmation,

you will be redirected to the invoice screen:

Here you change the invoiced party to the insurer:

In the middle on the left you click on “New Line”

Then you add a line for the excess and for the deductible VAT, putting in a negative amount:

Don’t forget to put the VAT Percentage to zero, and click on save.

You do the same for the VAT deductibility:

After saving to journal, you can create a new invoice for the customer with these items, by going to “Sales - Job” and clicking on the next to the job concerned:

And adding the vat & excess lines: