The BBC engaged in a "major breach" of media regulations by failing to disclose that the presenter of a film about Gaza was the child of a Hamas official, according to British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to factual correctness".
The authority has instructed the broadcaster to transmit a peak-time declaration about its decisions.
"As this represents a serious breach of our regulations, we are instructing the corporation to air a statement of our determinations against it on the BBC's second channel at 9pm, with a timing to be determined," the regulator stated.
'Risk to Damage Credibility'
The authority's report stated: "Our investigation determined that the film's omission to reveal that the voice's male guardian held a position in the Hamas-run administration was significantly deceptive.
"It meant that the viewers did not have critical information which may have been very significant to their judgment of the presenter and the details he provided.
"Credibility is at the core of the connection between a media organization and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to undermine the exceptionally strong levels of trust that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was withdrawn from the BBC's streaming service in February after the presenter's familial connections came to light, and in this past July an broadcaster's internal assessment concluded it violated the corporation's editorial guidelines on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on truthfulness, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept Ofcom's decision in complete. We will comply with the directive as soon as the timing and language are determined."