The Trump family’s $500 million luxury hotel project in Serbia, slated to be built on the site of a bombed-out Defense Ministry building, has run into an embarrassing complication. A key document the Serbian government has relied on to deliver this deal was forged, officials there said this week.

Jared Kushner, President Trump’s son-in-law, and his business partners plan to build a luxury residential and commercial complex on the site of the long-vacant compound that is slated to include a Trump International Hotel, the first in Europe.

The leader of the Serbian agency charged with protecting cultural monuments admitted to the authorities that he had forged a government document allowing the former Yugoslav Ministry of Defense headquarters in Belgrade to be demolished and replaced with the Trump hotel.

The project won tentative approval from the Serbian government last year, even before the government officially moved to revoke the protected historic status of the former Defense Ministry complex, which was heavily damaged during a 1999 bombing campaign by the North Atlantic Treaty Organization.

Serbian government officials say that the agency leader, Goran Vasic, fabricated an expert opinion to justify the government’s decision to strip the site of its cultural heritage status.

“Vasic forged a proposal for a decision to revoke the status of cultural property,” the Office of the Prosecutor for Organized Crime said in a statement.