Where a rule prescribes the format, the template follows it and says so: the delivery challan follows CGST Rule 55, and the salary slip covers the statutory deductions an Indian payslip should carry — EPF, ESI, professional tax and TDS. Where no rule applies — proforma invoices, quotations and purchase orders have no provision under GST at all — we say that plainly instead of implying a legal basis that does not exist, and the fields are presented as commercial best practice. Every page carries the basis and the date we last verified it.