The BBC engaged in a "significant breach" of media regulations by omitting to mention that the presenter of a documentary about the Gaza conflict was the child of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to truthfulness".
The regulator has instructed the BBC to transmit a peak-time statement about its decisions.
"Given this constitutes a serious breach of our code, we are directing the BBC to broadcast a announcement of our determinations against it on BBC2 at 9pm, with a schedule to be confirmed," it said.
'Risk to Undermine Confidence'
The authority's report said: "Our probe determined that the programme's lack of disclosure that the narrator's male guardian occupied a role in the Hamas-run authority was substantially inaccurate.
"Consequently that the audience did not have critical information which may have been very significant to their judgment of the voice and the content he presented.
"Confidence is at the heart of the bond between a television network and its audience, especially for a public service broadcaster such as the public broadcaster.
"This error had the potential to damage the significantly high amounts of trust that audiences would have put in a documentary produced by the BBC about the Israel-Gaza war."
The film was pulled from iPlayer in the month of February after the narrator's personal associations were revealed, and in July an corporation's own inquiry found it breached the broadcaster's journalistic standards on truthfulness.
A BBC spokesperson stated: "The Ofcom ruling is in line with the results of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on factual correctness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept Ofcom's decision in complete. We will adhere to the sanction as soon as the timing and wording are finalised."
