The BBC engaged in a "serious breach" of broadcasting rules by not revealing that the voice of a documentary about the Gaza conflict was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, saying there had been "a serious error in relation to truthfulness".
The regulator has directed the broadcaster to transmit a evening statement about its decisions.
"As this represents a major infringement of our rules, we are directing the broadcaster to broadcast a message of our conclusions against it on the BBC's second channel at 21:00, with a schedule to be determined," the statement read.
'Risk to Erode Confidence'
The watchdog's announcement said: "The inquiry we conducted found that the film's omission to reveal that the narrator's father held a post in the Hamas-administered government was significantly deceptive.
"It meant that the audience did not have critical information which may have been extremely pertinent to their evaluation of the narrator and the information he presented.
"Credibility is at the core of the connection between a television network and its public, notably for a state-funded media outlet such as the BBC.
"This failing had the possibility to damage the very considerable amounts of credibility that viewers would have put in a factual film from the broadcaster about the conflict in Gaza."
The programme was removed from iPlayer in the month of February after the presenter's family links emerged, and in July an broadcaster's internal assessment concluded it violated the organization's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with Ofcom's decision in its entirety. We will adhere to the directive as soon as the schedule and wording are confirmed."
