The BBC engaged in a "serious breach" of industry standards by not revealing that the voice of a documentary about the Gaza conflict was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The head of the BBC had already issued an apology, noting there had been "a serious error in relation to factual correctness".
The regulator has instructed the BBC to broadcast a prime-time statement about its findings.
"Since this amounts to a significant violation of our regulations, we are ordering the broadcaster to air a message of our conclusions against it on the BBC's second channel at 9pm, with a date to be determined," the statement read.
'Risk to Erode Trust'
The authority's statement said: "Our probe found that the programme's failure to disclose that the voice's father held a role in the Hamas-run authority was substantially inaccurate.
"It meant that the viewers did not have critical information which may have been highly relevant to their assessment of the presenter and the details he presented.
"Credibility is at the core of the bond between a television network and its public, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to undermine the very considerable degrees of trust that audiences would have put in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from iPlayer in last February after the boy's familial connections came to light, and in July an broadcaster's internal assessment determined it infringed the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson said: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on accuracy, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept Ofcom's decision in its entirety. We will follow the directive as soon as the schedule and language are finalised."
