In Public Sector Financials International there is a capability to create Periodic Invoices through

As part of this there is a setup step called Extended System Options which defines the Invoice Header and Line Transaction Flexfield Values. There is no detailed description in the implementation guide as to what the options are when setting these fields.

In my 12.2.9 Vision Instance the settings are

What do these mean and are there any other options?

The Header Value seems to cause the Standing Charge/Periodic Definition ID to be populated but since this isn't in fact displayed in the Maintenance window it is of not much use.