After base currency conversion
Legacy NCU trading requirement
Maintain price list in NCU for quotes and billing and price checking
Invoices, payments, Statements in NCU
Final changeover unavoidable
Carry forward outstanding transactions at latest 31.12.2001
Even after base conversion, there are legacy trading partners to deal with. Especially those who are paid in cash.
And even that is only for a short time; they will be forced to change by 31.12.2001.