The BBC was found to have committed a "major breach" of broadcasting rules by not revealing that the presenter of a film about Gaza was the offspring of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, saying there had been "a major oversight in relation to accuracy".
Ofcom has instructed the broadcaster to broadcast a evening statement about its findings.
"Given this constitutes a serious breach of our code, we are directing the broadcaster to air a message of our determinations against it on BBC Two at 21:00, with a timing to be confirmed," it said.
'Possibility to Damage Credibility'
The authority's report stated: "Our investigation determined that the film's omission to reveal that the narrator's father occupied a role in the Hamas-run government was significantly deceptive.
"It meant that the audience did not have essential details which may have been very significant to their assessment of the presenter and the content he presented.
"Credibility is at the core of the connection between a broadcaster and its public, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the possibility to undermine the significantly high levels of credibility that audiences would have placed in a factual film from the broadcaster about the Gaza conflict."
The film was pulled from the online platform in February after the narrator's personal associations emerged, and in July an broadcaster's internal assessment concluded it infringed the organization's content policies on accuracy.
A corporation official said: "The regulator's decision is in accordance with the findings of the internal assessment, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in complete. We will adhere to the sanction as soon as the date and wording are finalised."
