The BBC engaged in a "significant breach" of media regulations by not revealing that the narrator of a programme about the Gaza situation was the child of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
Ofcom has instructed the broadcaster to air a evening announcement about its decisions.
"As this represents a major infringement of our regulations, we are ordering the corporation to broadcast a statement of our determinations against it on the BBC's second channel at 21:00, with a timing to be finalised," it said.
'Potential to Erode Credibility'
The authority's report said: "Our probe determined that the programme's failure to disclose that the voice's father occupied a role in the Hamas-controlled government was materially misleading.
"It meant that the public did not have critical information which may have been extremely pertinent to their judgment of the voice and the content he shared.
"Confidence is at the heart of the connection between a media organization and its audience, especially for a national broadcasting corporation such as the BBC.
"This error had the potential to erode the significantly high degrees of trust that the public would have put in a BBC factual programme about the Gaza conflict."
The documentary was withdrawn from the BBC's streaming service in last February after the presenter's personal associations emerged, and in July an internal BBC review determined it breached the corporation's content policies on truthfulness.
A corporation official commented: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a major oversight in the film in relation to the corporation's content standards on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in complete. We will follow the directive as soon as the date and wording are confirmed."
