I have a recuring invoice.
When the recuring date is reached, a new invoice is created, with the correct invoice number (for exemple 2018F02-0010)
If I choose to send it by email, after validation, the invoice number is changed, increased by one !!! It’s now 2018F02-0011 !
So I now have a “hole” on my invocie numbers : the 2018F02-0010 doesn’t exist anymore !