Stormont MLAs have voted to continue post Brexit trading arrangements that apply to Northern Ireland.
It means some goods coming from Great Britain will continue to be subject to additional paperwork and checks.
The vote required a simple majority of MLAs, rather than the weighted majority that is sometimes needed at Stormont.
That meant it did not require a majority of both unionists and nationalists voting.
The motion passed by 48 votes to 36 - a majority of 57.1%, after a lengthy debate this evening.
It means the arrangements will continue for another four years.
The UK government must also now commission an independent review of the workings of the Northern Ireland Protocol/Windsor Framework to be published next year.
The protocol was adopted as part of an international agreement between the UK and the EU after Brexit.
It was supplemented by a later deal called the Windsor Framework.
The agreements applied the EU customs code and Single Market rules for goods in Northern Ireland.
That means goods coming into Northern Ireland from Great Britain must provide paperwork to show they comply with relevant EU rules and are not intended for the wider single market.
Those rules have become known as the Irish Sea border.
They were designed to avoid physical checks on the land border between Northern Ireland the Republic of Ireland.
Unionists have argued that the additional red tape undermines the constitutional position and creates friction in the internal UK market.
Unionists voted against the extension of the arrangements.
Sinn Féin, the SDLP and Alliance supported the continuation of the plan.
They point out that the arrangements give Northern Ireland access to both the UK and EU markets.
They say such dual market access provides potential economic advantage.
Secretary of State for Northern Ireland, Hilary Benn, said the government welcomed that MLAs "agreed on the continued application of the Windsor Framework".
"This democratic safeguard has provided the elected representatives of the people of Northern Ireland with a say over the trading arrangements that will apply over the next four years.
"I will now proceed as required by the law, including to commission an independent review.
"The government remains committed to implementing the Windsor Framework in good faith and protecting the UK internal market, in a way that offers stability and works for Northern Ireland, for businesses, and for traders," Mr Benn said.
