Creating and Editing Invoices

Invoice creation, editing, and related workflows in Haiku.lt. Each topic below has its own detailed guide.

• Invoice series and numbering — how series names work and how Haiku.lt keeps numbering sequential.
• Invoice fields reference — every field on the new-invoice form explained.
• Editing and locking invoices — making changes, marking paid, locking, and when to delete.
• Proforma invoices — when to use them and how they differ from regular invoices.
• Credit invoices — issuing refunds without deleting the original invoice.
• Due dates and payment terms — payment terms, due dates, and overdue tracking.