These are rules that are shared by all implementation of PINT compliant invoices. If any of these rules fails when validating an invoice message then that invoice is not a valid PINT invoice.
These rules are specific for Singapore invoices and shall be applied by all senders who are creating invoices that shallare only applied by receiver who have a receiving capability for Singapore invoice. Overseas receivers who are receiving invoices from Singapore but do not have a specific receiving capability for those will only apply the shared PINT rules and ignore these.