How do I exchange a net remit ticket in Amadeus?

Keep one original segment so the TST stays, TTU/S2-3 updates it, TTK/EXCH sets exchange mode, TTK/TEUR50 adds the collection and TTK/NF-680 the new net fare, then the old and new net remit FP, the FO and TTP/F/RT.

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When

A net remit ticket (your agency's contract fare) is changed with an additional collection.

Steps

#	Entry	What it does	Why
1	change the itinerary (keep one original segment)		TST stays.
2	`TTU/S2-3`	Updates the TST itinerary.
3	`TTK/EXCH`	Exchange mode.
4	`TTK/L1/BY2/V10FEB10FEB/A23K` · `TTK/L2/VXX10JUN`	Fare basis, validity, baggage.
5	`TTK/TEUR50`	Collection (fare + extra tax, without service fee).
6	`TTK/NF-680`	New net fare including the collection.	What your agency remits.
7	`TTK/X20YQ/X1.50UB`	Extra taxes (after the total).
8	delete the `FPO`, add `FPO/NR+CASH+/NR+CASH/EUR50` (market format)	Old and new net remit FP with the amount.	Net remit specific.
9	`TWD`, `FO*L14`	FO element.
10	`RF` + name, `TTP/F/RT`	Issues.

Traps

The net amount and tour code must match the contract; errors become debit memos.
Form-of-payment formats are market-specific (NONREF is a UK one).

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