The BBC engaged in a "major breach" of broadcasting rules by failing to disclose that the voice of a programme about the Gaza conflict was the son of a Hamas representative, as determined by British broadcasting authority Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The chief executive of the broadcaster had already issued an apology, saying there had been "a serious error in relation to truthfulness".
Ofcom has directed the corporation to transmit a prime-time declaration about its decisions.
"Given this constitutes a serious breach of our regulations, we are instructing the BBC to air a announcement of our determinations against it on BBC2 at 21:00, with a timing to be determined," the regulator stated.
'Potential to Undermine Credibility'
The regulator's report declared: "The inquiry we conducted found that the programme's omission to reveal that the presenter's father occupied a role in the Hamas-administered administration was substantially inaccurate.
"This implied that the audience did not have critical information which may have been extremely pertinent to their judgment of the narrator and the information he shared.
"Trust is at the core of the connection between a media organization and its public, notably for a state-funded media outlet such as the BBC.
"This oversight had the possibility to erode the very considerable levels of trust that audiences would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The programme was pulled from iPlayer in last February after the narrator's personal associations emerged, and in this past July an broadcaster's internal assessment found it violated the corporation's content policies on factual correctness.
A BBC spokesperson said: "The authority's determination is in line with the results of Peter Johnston's review, that there was a significant failing in the documentary in relation to the corporation's content standards on accuracy, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will follow the sanction as soon as the timing and wording are determined."
