The BBC was found to have committed a "serious breach" of media regulations by not revealing that the narrator of a programme about Gaza was the son of a Hamas official, as ruled by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The regulator has directed the BBC to air a evening announcement about its decisions.
"Since this amounts to a significant violation of our rules, we are ordering the corporation to transmit a statement of our determinations against it on the BBC's second channel at 21:00, with a date to be finalised," it said.
'Possibility to Undermine Trust'
The regulator's report declared: "The inquiry we conducted found that the programme's lack of disclosure that the voice's parent served in a role in the Hamas-controlled administration was materially misleading.
"It meant that the audience did not have vital facts which may have been very significant to their evaluation of the presenter and the information he shared.
"Confidence is at the center of the connection between a television network and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the possibility to undermine the very considerable levels of trust that audiences would have put in a factual film from the broadcaster about the Israel-Gaza war."
The programme was withdrawn from the online platform in the month of February after the narrator's personal associations were revealed, and in this past July an internal BBC review found it violated the organization's content policies on truthfulness.
A BBC spokesperson stated: "The Ofcom ruling is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in full. We will comply with the penalty as soon as the timing and wording are determined."
