The BBC committed a "major breach" of industry standards by failing to disclose that the presenter of a film about Gaza was the child of a Hamas administrator, as determined by UK media regulator Ofcom.
An inquiry by Ofcom into the programme 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 serious error in relation to factual correctness".
Ofcom has directed the corporation to broadcast a prime-time announcement about its conclusions.
"Since this amounts to a significant violation of our rules, we are ordering the BBC to transmit a message of our determinations against it on BBC2 at 21:00, with a timing to be confirmed," the regulator stated.
'Risk to Erode Credibility'
The watchdog's announcement declared: "The inquiry we conducted found that the programme's failure to disclose that the voice's parent served in a post in the Hamas-administered authority was substantially inaccurate.
"Consequently that the audience did not have essential details which may have been very significant to their evaluation of the voice and the details he presented.
"Confidence is at the center of the bond between a television network and its audience, notably for a public service broadcaster such as the BBC.
"This oversight had the risk to undermine the very considerable amounts of credibility that viewers would have invested in a documentary produced by the BBC about the Gaza conflict."
The film was withdrawn from the online platform in the month of February after the narrator's personal associations emerged, and in July an internal BBC review determined it breached the broadcaster's journalistic standards on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in line with the results of the internal assessment, that there was a serious error in the programme in relation to the corporation's content standards on truthfulness, which aligns with regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept the regulator's ruling in complete. We will follow the penalty as soon as the timing and wording are finalised."
