The BBC engaged in a "significant breach" of media regulations by not revealing that the voice of a programme about Gaza was the son of a Hamas administrator, as determined by UK media regulator Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to accuracy".
Ofcom has ordered the broadcaster to transmit a peak-time statement about its decisions.
"As this represents a serious breach of our code, we are instructing the broadcaster to transmit a message of our determinations against it on BBC Two at nine o'clock in the evening, with a schedule to be confirmed," it said.
'Risk to Undermine Confidence'
The authority's announcement stated: "Our probe found that the film's omission to reveal that the voice's male guardian served in a role in the Hamas-controlled administration was substantially inaccurate.
"This implied that the public did not have essential details which may have been very significant to their assessment of the narrator and the information he presented.
"Confidence is at the heart of the relationship between a broadcaster and its viewers, especially for a state-funded media outlet such as the public broadcaster.
"This failing had the possibility to undermine the exceptionally strong levels of confidence that audiences would have invested in a BBC factual programme about the Israel-Gaza war."
The film was withdrawn from the online platform in the month of February after the narrator's personal associations were revealed, and in the month of July an broadcaster's internal assessment concluded it breached the organization's content policies on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the conclusions of the internal assessment, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the regulator's ruling in full. We will follow the sanction as soon as the timing and wording are confirmed."
