The public service broadcaster committed a "serious breach" of industry standards by not revealing that the narrator of a documentary about the Gaza situation was the offspring of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a serious error in relation to factual correctness".
The regulator has ordered the corporation to broadcast a evening announcement about its findings.
"Since this amounts to a serious breach of our rules, we are directing the broadcaster to air a message of our determinations against it on BBC2 at 21:00, with a schedule to be determined," it said.
'Risk to Damage Credibility'
The watchdog's announcement stated: "The inquiry we conducted determined that the documentary's omission to reveal that the presenter's male guardian occupied a post in the Hamas-run administration was significantly deceptive.
"This implied that the public did not have critical information which may have been very significant to their assessment of the presenter and the details he presented.
"Trust is at the center of the relationship between a television network and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This error had the risk to undermine the very considerable degrees of trust that the public would have put in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the BBC's streaming service in last February after the narrator's familial connections emerged, and in July an corporation's own inquiry concluded it violated the organization's content policies on accuracy.
A corporation official stated: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the regulator's ruling in full. We will adhere to the directive as soon as the timing and language are confirmed."
