The public service broadcaster committed a "major breach" of broadcasting rules by omitting to mention that the narrator of a programme about the Gaza conflict was the offspring of a Hamas representative, as ruled by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The head of the BBC had previously apologised, stating there had been "a serious error in relation to accuracy".
The regulator has directed the BBC to transmit a evening declaration about its conclusions.
"Given this constitutes a serious breach of our rules, we are instructing the broadcaster to transmit a statement of our findings against it on BBC2 at nine o'clock in the evening, with a schedule to be finalised," it said.
'Possibility to Damage Credibility'
The regulator's announcement stated: "Our probe determined that the documentary's failure to disclose that the voice's father held a position in the Hamas-administered administration was materially misleading.
"This implied that the public did not have essential details which may have been extremely pertinent to their evaluation of the presenter and the content he shared.
"Credibility is at the center of the connection between a broadcaster and its public, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to undermine the exceptionally strong levels of confidence that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The film was removed from the BBC's streaming service in last February after the narrator's family links were revealed, and in July an internal BBC review found it violated the broadcaster's editorial guidelines on truthfulness.
A representative for the broadcaster stated: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the programme in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept Ofcom's decision in its entirety. We will follow the sanction as soon as the schedule and language are determined."
