The BBC engaged in a "significant breach" of broadcasting rules by failing to disclose that the voice of a documentary about the Gaza situation was the child of a Hamas official, according to British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the BBC to transmit a evening declaration about its findings.
"Given this constitutes a major infringement of our rules, we are instructing the BBC to transmit a message of our determinations against it on the BBC's second channel at 21:00, with a timing to be confirmed," the regulator stated.
'Potential to Erode Credibility'
The authority's statement declared: "The inquiry we conducted found that the programme's failure to disclose that the narrator's father served in a role in the Hamas-controlled authority was substantially inaccurate.
"Consequently that the viewers did not have vital facts which may have been highly relevant to their assessment of the narrator and the content he provided.
"Credibility is at the center of the connection between a media organization and its audience, particularly for a national broadcasting corporation such as the BBC.
"This error had the possibility to damage the very considerable amounts of trust that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from iPlayer in the month of February after the presenter's familial connections were revealed, and in the month of July an corporation's own inquiry found it violated the corporation's editorial guidelines on factual correctness.
A representative for the broadcaster stated: "The Ofcom ruling is in accordance with the findings of the internal assessment, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the authority's determination in its entirety. We will adhere to the directive as soon as the timing and wording are finalised."
