How do I reissue with a fare difference in Galileo?

Quote the new journey with FQ, remove already paid taxes in the fare build (*FB1, FBUTAX, FBF), then TMU1FEX2201234500012, pay the difference in the masks, ER and TKP. The response shows ADC.
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When

The client changes the trip and the new fare, the new taxes, or both cost more than the old ticket. The old ticket pays part, and the difference is collected on the reissue (an ADC, additional collection).

Check first

  • The fare rules allow the change, and what penalty applies. Read the penalties closely — the airline's rules beat any standard pattern.
  • *HTE: the coupons being changed are OPEN, and note the original issue date (05OCT26 here).
  • Which quote to use — it depends on what changed:
What changedQuote
Before departure, the outboundFQ (or FQT = as if booked today, only with the airline's permission)
Before departure, only the inbound, same routingFQ.T05OCT26 — fare and taxes as on the original issue date
Before departure, only the inbound, new routingFQ.H05OCT26 — fare as on that date, today's taxes
After departure, same routingFQ.T05OCT26
After departure, new routingFQ.H05OCT26

Steps

#EntryWhat it doesWhy
1—Book the new flights.See Cancel segments or change the date, class or flight.
2FQ or FQ.T05OCT26 / FQ.H05OCT26Quotes the new journey (table above).The right fare date is the core of a correct reissue.
3*FB1Opens filed fare 1 as a manual fare build.Taxes need adjusting.
4FBUTAX1/+TAX2/+TTL/Removes the taxes already paid on the old ticket; keeps the new ones; resets the total.Only the taxes not yet paid are collected.
5*FB, then FBFChecks and files the fare.
6EREnds and retrieves.
7TMU1FEX2201234500012Opens the exchange masks for filed fare 1.Galileo works out the difference between the old and the new fare.
8—In the masks, enter the form of payment for the difference and press Enter after it.This pays the ADC.
9ER, then TKPIssues the new ticket.The response shows ADC and the amount collected.

Check it worked

  • *HTE: new ticket on the new flights; old ticket EXCH.
  • *MR1/1 reopens the additional payment mask (filed fare 1, passenger 1). It does not exist after an even exchange.

Traps

  • Taxes that no longer apply (for example a departure tax of a city the client no longer leaves from) can be given back inside the exchange by adding them to the old ticket's value in the mask. Many agents skip this; if you skip it, leave those taxes in the paid-taxes area.
  • After departure the rebooking modifiers FQBB and FQBC do not work with a historical quote. If no historical quote fits (a minimum stay is now broken, for example), find the right fare in a fare display and force it with FQ@ + fare basis + .T05OCT26 — class and brand equal or higher.
  • If the flown segment is still in the booking file, the quote includes it and cannot be used as it is; build a fare for the remaining segments by hand (Build a fare by hand (FBC, FBU, FBF)).
  • A change fee can be charged on an EMD-S linked to the ticket (Issue an EMD — EMD-A for a service, EMD-S for a fee). The /EP$ penalty modifier is ARC (US) only.
  • Several passengers: TKP1FEX…/P1 per passenger (see Even exchange (reissue a ticket) — new flights, same fare and taxes).

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