The BBC committed a "major breach" of broadcasting rules by failing to disclose that the voice of a documentary about Gaza was the son of a Hamas official, as ruled by regulatory body 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, stating there had been "a major oversight in relation to accuracy".
Ofcom has ordered the corporation to transmit a evening announcement about its decisions.
"Given this constitutes a major infringement of our rules, we are ordering the broadcaster to transmit a statement of our conclusions against it on BBC2 at 9pm, with a date to be determined," the regulator stated.
'Potential to Undermine Confidence'
The regulator's report said: "Our investigation determined that the film's failure to disclose that the narrator's parent served in a post in the Hamas-controlled government was substantially inaccurate.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their judgment of the voice and the information he presented.
"Trust is at the heart of the connection between a media organization and its audience, particularly for a public service broadcaster such as the BBC.
"This error had the possibility to damage the exceptionally strong degrees of confidence that the public would have invested in a BBC factual programme about the Gaza conflict."
The programme was removed from the online platform in last February after the presenter's personal associations emerged, and in July an internal BBC review concluded it breached the organization's content policies on factual correctness.
A representative for the broadcaster said: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a serious error in the film in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with Ofcom's decision in full. We will follow the penalty as soon as the date and wording are determined."
