This should be set in the CRM settings - select "Other settings", the tab "Invoice numbers":
Invoice numbers in Bitrix24
[ Closed] CRM forms
Mailing to many email contacts
[ Closed] CRM forms
[ Closed] Integration with mail.ru
[ Closed] Error in the operation of the UniSender Automatic Distribution Filter in Bitrix24
Mailing to many email contacts
[ Closed] Integration with mail.ru
[ Closed] How to change the responsible for lead from letters
[ Closed] Mailing automation in Bitrix24, prepared in Mailchimp
