Why is the store currency locked after the first order?

Locking currency after the first order is not arbitrary restriction but an accounting safety valve: changing currency after selling starts re-labels an entire financial history and mixes figures across currencies in reports, orders, and payments. So the system swaps the picker for a clear lock notice, keeps past orders in their original currency, and requires any later migration through support as an audited conversion. See changing store currency, whether old orders change with currency, and multi-currency support.

Why locking is essential

1. Every order records totals in its creation-moment currency; later changes detach figures from context.
2. Financial reports would sum amounts across currencies, producing misleading results detached from reality.
3. Payment gateways convert at pay time in the original order currency, and mixing confuses settlements.
4. The currency-change history log documents moves, but never substitutes currency stability itself.
5. Locking guards the merchant against one mistake ruining years of accounting records.
6. Support-led migration with audited conversion is the only safe path under extreme necessity.

Recommended practices

• Treat the first currency pick as final and study it before the first sale.
• Never promise customers multi-currency before confirming the settings available in your store.
• When expanding to a new market with another currency, consult support on available options.
• Keep an external log of each accounting-period currency to ease tax review.
• Explain the lock policy to your team so nobody attempts UI currency changes after locking.