four subsequent subsections covering one option in each subsection.
By way of context:
any Prepayment Top Up Message is a Remote Party Command in GBCS terms (because it is from a Remote Party to a GSME or ESME). The means of delivery (typing in on meter, typing in on PPMID, sending over WAN, etc.) does not affect this classification;
as a Remote Party Command, it must result in the GSME or ESME generating a Response back to the Remote Party who issued it (so the Supplier), unless there is an Authentication failure (in which case the Supplier has to be sent an Alert), as per SMETS and CHTS;
because the ranges are exclusive, the Originator Counter in Prepayment Top Up transactions cannot collide with the Originator Counter in any other transaction; and
there is no requirement to include the Device’s ID explicitly in the locally entered transaction, so a PPMID joined to more than one Smart Meter will need to allow the Consumer to pick which Smart Meter the Prepayment Top Up is for.