Removal of BGN ccy from the list

[princekm096]

Effective January 1, 2026, Bulgaria will adopt the Euro (EUR) as its official currency. Accordingly, the BGN currency code should be removed from the ISO 4217 validation list.

[pscheid92]

Additional information:

• Mandatory dual price display: 08.08.2025 to 08.08.2026
• Parallel circulation period: 01.01.2026 to 31.01.2026 inclusive

Bulgarian Lev (BGN) and Euro (EUR) will be used during the parallel circulation period from 01.01.2026 to 31.01.2026 inclusive. The period of mandatory dual price display lasts from 08.08.2025 to 08.08.2026.

Source:
https://www.six-group.com/en/products-services/financial-information/market-reference-data/data-standards.html

I don't know how this should be handled in the validator, though.

[princekm096]

@pscheid92 Thanks for the additional info. Since there is a parallel circulation period until Jan 31, 2026, perhaps that should be our hard cutoff date? That way, we support the transition month without keeping the code indefinitely after it's fully deprecated.