In procurement offices across Slovenia, the humble bill of materials has suddenly become the most scrutinised document in the building. Under the EU's 'Made in Europe' plan — the Germany-and-France-backed push that has unnerved global auto suppliers — the question of where every washer, wiring harness and battery cell comes from is no longer housekeeping. It is now the difference between qualifying for EU subsidies and being left out in the cold.

The mechanics of the plan are strikingly blunt. Cars imported from Japan would not qualify for EU subsidies at all. Models built in France, Portugal and Eastern Europe — Slovenia's home turf — would benefit, but only if enough of their parts come from Europe. That conditional is doing heavy lifting: assembly location alone no longer unlocks the money, and the passport of every component now matters as much as the badge on the bonnet.

For global suppliers, that single clause raises precisely the costs and competitiveness concerns that have rippled through the industry since the plan emerged. Suppliers with European footprints but supply chains stretching deep into Asia now face a fork in the road: re-source components inside Europe, with all the requalification and expense that implies, or watch their customers' vehicles slip off the subsidy list. Either way, someone pays the bill.