For scenarios where the Recurring Invoice Template includes a line that is only applicable to the first invoice generated from the template we have included the 'First Invoice Only' field:
Figure 1 | 'First Invoice Only' Field
As its name suggests, the first invoice that is created from the template will include the line. After generating the invoice the 'Added to First Invoice' field is automatically ticked, and the line is then subsequently excluded from all future invoices.
Figure 2 | 'First Invoice Only' Field