The British broadcaster engaged in a "major breach" of media regulations by not revealing that the presenter of a film about the Gaza conflict was the son of a Hamas administrator, as ruled by UK media regulator Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to accuracy".
The regulator has directed the BBC to transmit a peak-time declaration about its conclusions.
"Since this amounts to a significant violation of our regulations, we are instructing the BBC to air a message of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a timing to be confirmed," it said.
'Risk to Erode Confidence'
The regulator's statement stated: "The inquiry we conducted found that the programme's failure to disclose that the presenter's father held a position in the Hamas-administered government was materially misleading.
"This implied that the public did not have essential details which may have been highly relevant to their assessment of the presenter and the information he provided.
"Credibility is at the heart of the connection between a television network and its public, especially for a national broadcasting corporation such as the BBC.
"This oversight had the risk to damage the exceptionally strong amounts of credibility that audiences would have put in a documentary produced by the BBC about the Gaza conflict."
The documentary was withdrawn from iPlayer in the month of February after the presenter's familial connections emerged, and in this past July an broadcaster's internal assessment found it breached the corporation's content policies on factual correctness.
A BBC spokesperson stated: "The authority's determination is in agreement with the findings of the corporation's inquiry, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on accuracy, which corresponds to regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will comply with the sanction as soon as the schedule and wording are finalised."
