The BBC engaged in a "significant breach" of media regulations by omitting to mention that the narrator of a programme about the Gaza situation was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The BBC's director general had already issued an apology, noting there had been "a significant failing in relation to factual correctness".
The regulator has ordered the broadcaster to transmit a prime-time declaration about its findings.
"Since this amounts to a serious breach of our code, we are ordering the BBC to broadcast a announcement of our conclusions against it on BBC2 at nine o'clock in the evening, with a schedule to be finalised," the statement read.
'Possibility to Damage Trust'
The authority's statement declared: "Our investigation found that the documentary's lack of disclosure that the presenter's father held a post in the Hamas-controlled government was significantly deceptive.
"It meant that the audience did not have critical information which may have been very significant to their judgment of the voice and the details he provided.
"Trust is at the core of the relationship between a broadcaster and its public, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the possibility to erode the very considerable degrees of credibility that audiences would have put in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in the month of February after the narrator's familial connections were revealed, and in this past July an broadcaster's internal assessment concluded it breached the organization's editorial guidelines on accuracy.
A corporation official commented: "The authority's determination is in line with the findings of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 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 comply with the sanction as soon as the schedule and language are confirmed."
